bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on a high-sensitivity asymmetric metamaterial structure and its application as microwave sensor
Authors: Cao Yunhao , Ruan Cunjun , Chen Kanglong , Zhang Xingyun 
Published: January 2022

AbstractIn this paper, an Asymmetric Electric Split-Ring Resonator (AESRR) metamaterial structure is proposed to explore the interaction between metamaterials and electromagnetic waves with the influence of Fano resonance on electromagnetic properties. With the symmetry of basic electric Split-Ring Resonator (eSRR) being broken, a new Fano resonant peak appears at around 11.575 GHz and this peak is very sensitive to the dielectric environment. Based on the proposed high sensitivity of AESRR, a microwave sensor based on a 13 × 13 arrays of AESRR was designed and verified using printed circuit board (PCB) technology. T-shape channel was integrated to the sensor by grooving in the FR-4 substrate which improved the integration and provided the feasibility of liquids detection. Seven organic liquids and four dielectric substrates are measured by this sensor. The measured results show the transmission frequency shifts from 11.575 to 11.150 GHz as the liquid samples permittivity changes from 1 to 7 and the transmission frequency shifts from 11.575 to 8.260 GHz as the solid substrates permittivity changes from 1 to 9. The results have proven the improved sensitivity and the larger frequency shift ∆f on material under test (MUTs) compared with the conventional reported sensor. The relative permittivity of liquid samples and solid samples can be obtained by establishing approximate models in CST, respectively. Two transcendental equations derived from measured results are proposed to predict the relative permittivity of liquid samples and solids samples. The accuracy and reliability of measured results and predicted results are numerically verified by comparing them with literature values. Thus, the proposed sensor has many advantages, such as low-cost, high-sensitivity, high-robustness, and extensive detecting range, which provided a great potential to be implemented in a lab-on-a-chip sensor system in the future.
Flanking sequences influence the activity of TET1 and TET2 methylcytosine dioxygenases and affect genomic 5hmC patterns
Authors: Adam Sabrina , Bräcker Julia , Klingel Viviane , Osteresch Bernd , Radde Nicole E. , Brockmeyer Jens , Bashtrykov Pavel , Jeltsch Albert 
Published: January 2022

AbstractTET dioxygenases convert 5-methylcytosine (5mC) preferentially in a CpG context into 5-hydroxymethylcytosine (5hmC) and higher oxidized forms, thereby initiating DNA demethylation, but details regarding the effects of the DNA sequences flanking the target 5mC site on TET activity are unknown. We investigated oxidation of libraries of DNA substrates containing one 5mC or 5hmC residue in randomized sequence context using single molecule readout of oxidation activity and sequence and show pronounced 20 and 70-fold flanking sequence effects on the catalytic activities of TET1 and TET2, respectively. Flanking sequence preferences were similar for TET1 and TET2 and also for 5mC and 5hmC substrates. Enhanced flanking sequence preferences were observed at non-CpG sites together with profound effects of flanking sequences on the specificity of TET2. TET flanking sequence preferences are reflected in genome-wide and local patterns of 5hmC and DNA demethylation in human and mouse cells indicating that they influence genomic DNA modification patterns in combination with locus specific targeting of TET enzymes.
A global path planning algorithm based on the feature map
Authors: Ren Gongchang , Liu Peng , He Zhou 
Published: January 2022

AbstractThe feature map is a characteristic of high computational efficiency, but it is seldom used in path planning due to its lack of expression of environmental details. To solve this problem, a global path planning algorithm based on the feature map is proposed based on the directionality of line segment features. First, the robot searches the path along the direction of the target position but turns to search in the direction parallel to the obstacle, which it approaches until the line between the robot and the target position does not intersect with obstacles. Then it turns to the target position, keep searching the path. Meanwhile, the problems of the direction selection of turning point, corner point and obstacle circumvention in the searching process are analysed and corresponding solutions are put forth. Finally, a path optimisation algorithm with variable parameters is proposed, making the optimised path shorter and smoother. Simulation experiments demonstrate that the proposed algorithm is superior to A* algorithm in terms of computation time and path length, especially of the computation efficiency.The cover image is based on the Research Article A global path planning algorithm based on the feature map by Peng Liu et al., https://doi.org/10.1049/csy2.12040.
Generic profile of a long-lived corotating interaction region and associated recurrent Forbush decrease
Authors: Dumbović M. , Vršnak B. , Temmer M. , Heber B. , Kühl P. 
Published: January 2022

Context.Corotating interaction regions (CIRs), formed by the interaction of slow solar wind and fast streams that originate from coronal holes (CHs), produce recurrent Forbush decreases, which are short-term depressions in the galactic cosmic ray (GCR) flux.Aims.Our aim is to prepare a reliable set of CIR measurements to be used as a textbook for modeling efforts. For that purpose, we observe and analyse a long-lived CIR, originating from a single CH, recurring in 27 consecutive Carrington rotations 2057–2083 in the time period from June 2007–May 2009.Methods.We studied the in situ measurements of this long-lived CIR as well as the corresponding depression in the cosmic ray (CR) count observed by SOHO/EPHIN throughout different rotations. We performed a statistical analysis, as well as the superposed epoch analysis, using relative values of the key parameters: the total magnetic field strength,B, the magnetic field fluctuations,dBrms, plasma flow speed,v, plasma density,n, plasma temperature,T, and the SOHO/EPHIN F-detector particle count, and CR count.Results.We find that the mirrored CR count-time profile is correlated with that of the flow speed, ranging from moderate to strong correlation, depending on the rotation. In addition, we find that the CR count dip amplitude is correlated to the peak in the magnetic field and flow speed of the CIR. These results are in agreement with previous statistical studies. Finally, using the superposed epoch analysis, we obtain a generic CIR example, which reflects the in situ properties of a typical CIR well.Conclusions.Our results are better explained based on the combined convection-diffusion approach of the CIR-related GCR modulation. Furthermore, qualitatively, our results do not differ from those based on different CHs samples. This indicates that the change of the physical properties of the recurring CIR from one rotation to another is not qualitatively different from the change of the physical properties of CIRs originating from different CHs. Finally, the obtained generic CIR example, analyzed on the basis of superposed epoch analysis, can be used as a reference for testing future models.
Digitale Weiterbildung – Herausforderung in der aktuellen Situation
Authors: Blätzinger Markus 
Published: January 2022

ZusammenfassungDigitales Lernen und digitale Fort- und Weiterbildung sind nicht erst seit den aktuellen Coronamaßnahmen ein Thema in der Medizin. Dieser Artikel möchte einen kurzen Überblick über
Techniken und Konzepte geben, diese grob einordnen und dazu ermutigen, neue digitale Wege in der Fort- und Weiterbildung auch im operativen Bereich der Medizin anzugehen, ohne die Nachteile
und Grenzen dieser Technologien zu ignorieren.
Alarmierung zum Einsatzstichwort Seuchenverdacht in einer Großstadt: schwerer Verlauf einer Malaria tropica
Authors: Breuer Florian , Pfäfflin Frieder , Poloczek Stefan , Pommerenke Christopher , Spielmann Eiko , Dahmen Janosch 
Published: January 2022

ZusammenfassungRettungswagen und Notarzteinsatzfahrzeug werden zu einer Reanimationssituation alarmiert, bei der es zum Versterben eines männlichen Patienten kommt. Dieser hat zuvor über unspezifische
grippale Symptomatik und ausgeprägte Diarrhöen geklagt sowie febrile Temperaturen entwickelt. Gemeinsam mit der Ehefrau befand er sich zuvor auf einer Reise in Togo. Aufgrund von ähnlichen
Symptomen kommt es am Folgetag zu einem Einsatz bei der Ehefrau, wodurch zunächst der Verdacht auf eine High Consequence infectious Disease (HCID) bestand, im Verlauf jedoch eine Malaria
wahrscheinlich erschien. Unter Einbeziehung von öffentlichem Gesundheitsdienst und einer Schwerpunktklinik wurde die Transportstrategie festgelegt. Während des stationären Aufenthaltes wurde
eine Malaria tropica diagnostiziert, eine Prophylaxe erfolgte vor Reiseantritt nicht.
Resident and Fellow Participation Does Not Affect Short-Term Postoperative Complications After Distal Radius Fracture Fixation
Authors: Gordon Adam M. , Ashraf Asad M. , Magruder Matthew L. , Conway Charles A. , Sheth Bhavya K. , Choueka Jack 
Published: January 2022

Abstract
Background Complications after open reduction internal fixation (ORIF) for distal radius fractures (DRF) are well documented, but the impact of trainee involvement on postoperative outcomes has not been studied.
Questions Does trainee involvement affect postoperative complication rates and length of hospital stay?
Methods The American College of Surgeons National Surgical Quality Improvement Program was queried from 2006 to 2012 for patients undergoing DRF ORIF. A 1:1 propensity score matched resident/fellow involved cases to attending-only cases. Demographics, length of stay, and postoperative complications were compared between the two groups. Logistic regression was used to evaluate independent predictors of adverse events and to evaluate cases with and without trainee involvement.
Results Overall, 3,003 patients underwent DRF ORIF from 2006 to 2012. After matching, 1,150 cases (50% with resident/fellow involvement) were included. The overall rate of adverse events was 4.4% (46/1,050). There were no significant differences in the short-term complication rate in trainee-involved (2.3%) versus attending-only cases (3.9%) (p = 0.461). For ORIF of DRF, there were no significant differences, between attending-only cases and resident/fellow-involved cases, with regard to short-term major complications (p = 0.720) or minor complications (p = 0.374). Length of hospital stay was similar between cohorts (1.22 vs. 0.98 days) (p = 0.723). On multivariate analysis, trainee involvement was not an independent predictor of minor, major, or any complication after DRF fixation after controlling for multiple independent factors (all p > 0.364).
Discussion Trainee participation in DRF ORIF is not associated with increased risk of short-term (30 days) medical or surgical postoperative complications.
Level of Evidence This is a Level IV case–control study.
A Great Divide: Polish media discourse on migration, 2015–2018
Authors: Troszyński Marek , El-Ghamari Magdalena 
Published: January 2022

AbstractThe widely described migration crisis in Europe took place in 2015–2018. Like any major event, it was covered by the media in a variety of ways. While one could find analyses of the related media content for many European countries, a comprehensive study for Poland has not been previously conducted. This paper describes the Polish media’s divided positions on migration from 2015 to 2018. The media content analysis was based on the monitoring of the press, television, and the Internet. The following research techniques were used: (1) a summary of the number of messages over particular months to show the intensity of the phenomenon, (2) quantitative analysis employing corpus linguistics (CL), (3) qualitative analysis using critical discourse analysis (CDA). The analyses revealed a sharp divide between conservative and liberal discourses. These differences—tone, sentiment, and subject matter—were apparent in how the migration crisis was described. Conservative media only showed negative aspects of migration, and if there were no such issues in Poland, protests against migrants in Europe became their chosen topic. Liberal media much more often referred to the specificity of migration to Poland (economic migration from Ukraine) and showed the need for solidarity with migrants. However, the dominant difference was the political sympathies of individual media. We have shown divisions in media coverage based on this very factor. Tabloid coverage was not associated with any political party; it criticized the actions of the government and the opposition. However, the most critical perspective from which we want to describe the collected material is the securitization of migration. The subject of security is present in each analysed discourse, regardless of political divisions. Our research shows though that the intensity of threats is more significant in the right-wing press.
Multitarget nociceptor sensitization by a promiscuous peptide from the venom of the King Baboon spider
Authors: Finol-Urdaneta Rocio K. , Ziegman Rebekah , Dekan Zoltan , McArthur Jeffrey R. , Heitmann Stewart , Luna-Ramirez Karen , Tae Han-Shen , Mueller Alexander , Starobova Hana , Chin Yanni K.-Y. , Wingerd Joshua S. , Undheim Eivind A. B. , Cristofori-Armstrong Ben , Hill Adam P. , Herzig Volker , King Glenn F. , Vetter Irina , Rash Lachlan D. , Adams David J. , Alewood Paul F. 
Published: January 2022

Significance
Pain development and discomfort are universal features of spider envenomation, yet severe pain arising from bites by Old World spiders is poorly understood. Molecular analyses of the venom of the King Baboon spider revealed abundant expression of the inhibitory cystine knot peptide Pm1a. Synthetic Pm1a induces pain in mice while simultaneously enhancing proexcitatory sodium currents and decreasing inhibitory potassium currents. These concomitant effects promote hyperexcitability in pain-sensing neurons that can be reversed by pharmacological inhibition of voltage-gated sodium channels. The coordinated modulation of excitatory and inhibitory ion channels involved in pain propagation may represent an economical and effective defense strategy in pain-inducing defensive venoms.
Metal loaded nano-carbon gas sensor array for pollutant detection
*
Authors: Behi Syrine , Casanova-Chafer Juan , González Ernesto , Bohli Nadra , Llobet Eduard , Abdelghani Adnane 
Published: January 2022

Abstract
Many research works report a sensitive detection of a wide variety of gas species. However, their in-lab detection is usually performed by using single gases and, therefore, selectivity often remains an unsolved issue. This paper reports a four-sensor array employing different nano-carbon sensitive layers (bare graphene, SnO2@Graphene, WO3@Graphene, and Au@CNTs). The different gas-sensitive films were characterised via several techniques such as FESEM, TEM, and Raman. First, an extensive study was performed to detect isolated NO2, CO2, and NH3 molecules, unravelling the sensing mechanism at the operating temperatures applied. Besides, the effect of the ambient moisture was also evaluated. Afterwards, a model for target gas identification and concentration prediction was developed. Indeed, the sensor array was used in mixtures of NO2 and CO2 for studying the cross-sensitivity and developing a calibration model. As a result, the NO2 detection with different background levels of CO2 was achieved with an R
2 of 0.987 and an RMSE of about 22 ppb.
On the stability of solitary wave solutions for a generalized fractional Benjamin–Bona–Mahony equation
Authors: Oruc Goksu , Natali Fábio , Borluk Handan , Muslu Gulcin M 
Published: January 2022

Abstract
In this paper we establish a rigorous spectral stability analysis for solitary waves associated to a generalized fractional Benjamin–Bona–Mahony type equation. Besides the well known smooth and positive solitary wave with large wave speed, we present the existence of smooth negative solitary waves having small wave speed. The spectral stability is then determined by analysing the behaviour of the associated linearized operator around the wave restricted to the orthogonal of the tangent space related to the momentum at the solitary wave. Since the analytical solution is not known, we generate the negative solitary waves numerically by using Petviashvili method. We also present some numerical experiments to observe the stability properties of solitary waves for various values of the order of nonlinearity and fractional derivative. Some remarks concerning the orbital stability are also celebrated.
Diastolic function: modeling left ventricular untwisting as a damped harmonic oscillator
Authors: Gamble Forrest N , Aufan M Rifqi , Sharifov Oleg F , Williams Lamario J , Reighard Shane , Calhoun David A , Gupta Himanshu , Dell’Italia Louis J , Denney Thomas S , Lloyd Steven G 
Published: January 2022

Abstract

Objective. We developed a method using cardiovascular magnetic resonance imaging to model the untwisting of the left ventricle (LV) as a damped torsional harmonic oscillator to estimate shear modulus (intrinsic myocardial stiffness) and frictional damping, then applied this method to evaluate the torsional stiffness of patients with resistant hypertension (RHTN) compared to a control group. Approach. The angular displacement of the LV during diastole was measured. Myocardial shear modulus and damping constant were determined by solving a system of equations modeling the diastolic untwisting as a damped, unforced harmonic oscillator, in 100 subjects with RHTN and 36 control subjects. Main Results. Though overall torsional stiffness was increased in RHTN (41.7 (27.1–60.7) versus 29.6 (17.3–35.7) kdyn*cm; p = 0.001), myocardial shear modulus was not different between RHTN and control subjects (0.34 (0.23–0.50) versus 0.33 (0.22–0.46) kPa; p = 0.758). RHTN demonstrated an increase in overall diastolic frictional damping (6.13 ± 3.77 versus 3.35 ± 1.70 kdyn*cm*s; p < 0.001), but no difference in damping when corrected for the overlap factor (74.3 ± 25.9 versus 68.0 ± 24.0 dyn*s/cm3; p = 0.201). There was an increase in the polar moment (geometric component of stiffness; 11.47 ± 6.95 versus 7.58 ± 3.28 cm4; p <0.001). Significance. We have developed a phenomenological method, estimating the intrinsic stiffness and relaxation properties of the LV based on restorative diastolic untwisting. This model finds increased overall stiffness in RHTN and points to hypertrophy, rather than tissue- level changes, as the major factor leading to increased stiffness.
Displacement-maintaining piezoelectric actuator without friction
Authors: Liu Kaiyuan , Han Wenwen , Gu Haoyu , Song Siyang , Shao Yan , Shao Shubao , Xu Minglong 
Published: January 2022

Abstract
We propose a displacement-maintaining piezoelectric actuator based on a hysteresis loop and a displacement-voltage loop. Remnant polarization and remnant strain of piezoelectric material depend on maximum applied electric field. By adjusting the peak and valley of the applied voltage, the displacement-voltage loop of piezoelectric material is changed, and our proposed actuator can have different displacement states at zero voltage. In order to verify that this actuator is practical, a commercially available piezoelectric stack using modified lead zirconate-lead titanate is used as a drive unit. Experiments show that the actuator can maintain displacement without friction. Moreover, the relationships between maintainable displacement and the peak and valley of applied voltage are obtained. The actuator can continuously adjust the maintainable displacement with nanometer-level resolution and micron-level stroke. This work provides a method to maintain continuously adjusting displacement at zero voltage without friction, which can be expected to expand the range of application of piezoelectric materials in precision actuators.
A study of electroactive polyvinyl chloride (PVC) gel actuators through the use of the electric modulus formalism and cyclic linear voltage sweeps
Authors: Frank Zachary , Al-Rubaiai Mohammed , Tan Xiaobo , Kim Kwang J 
Published: January 2022

Abstract
The conductivity and dielectric properties are integral to the function of polyvinyl chloride (PVC) gel actuators. The frequency-dependent properties of PVC gel actuators are investigated here in terms of their impedance, permittivity, and for the first time, electric modulus. The data shows that PVC gels’ conductive properties are just as, if not more, important as their dielectric properties in electromechanical transduction applications. The electrode polarization (EP) and its impact on the impedance and dielectric spectra of PVC gels, as well as the developed asymmetric space charge at the anode, are discussed. The electric modulus and tan

δ

spectra are used for the fitting of Cole-Cole (CC) and Debye relaxation models for gels of varying plasticizer content. The electrostatic adhesive force for PVC gels of varying plasticizer is also measured, indicating large electrostatic adhesion (>2 N cm−2). A cyclic linear voltage sweep is used to clarify the dynamics of space charge within the gels. The peak current (associated with space charge development) is seen to be concurrent with the onset of mechanical deformation, showing the asymmetric charge as the origin of electromechanical transduction. Additionally, the maximum charge transferred (as measured by the integration of current over time) before space charge development is found to correlate with the electrostatic adhesive force measured for the gels, pointing to a new method of characterizing PVC gels for actuation.
Non-minimally coupled vector boson dark matter
Authors: Barman Basabendu , Bernal Nicolás , Das Ashmita , Roshan Rishav 
Published: January 2022

Abstract
We consider a simple abelian vector dark matter (DM) model, where only the DM (X̃μ) couples non-minimally to the scalar curvature (R̃) of the background spacetime via an operator of the form ∼X̃μ
X̃μ
R̃. By considering the standard freeze-out scenario, we show, it is possible to probe such a non-minimally coupled DM in direct detection experiments for a coupling strength ξ∼𝒪(1030) and DM mass m
X ≲ 55 TeV, satisfying Planck observed relic abundance and perturbative unitarity. We also discuss DM production via freeze-in, governed by the non-minimal coupling, that requires ξ ≲10-5 to produce the observed DM abundance over a large range of DM mass depending on the choice of the reheating temperature. We further show, even in the absence of the non-minimal coupling, it is possible to produce the whole observed DM abundance via 2-to-2 scattering of the bath particles mediated by massless gravitons.
Uncertainty budget for PTB’s gonioreflectometers and ways to improve it in the short VIS spectral range
Authors: Santourian Irina , Quast Tatjana , Schirmacher Alfred 
Published: January 2022

Abstract
This paper describes a detailed derivation of the uncertainty budget for measurements of the absolute spectral radiance factor with PTB’s gonioreflectometers. The measurement uncertainty is determined according to the ‘Guide to the expression of uncertainty in measurement’ provided by the Bureau International des Poids et Mesures. To give an insight, the uncertainty analysis is applied to measurements of three ceramic samples. The influence of different systematic and statistical sources of uncertainty and their contributions are discussed in detail. For wavelengths larger than 450 nm the total measurement uncertainty is dominated by systematic contributions. Towards UVA the major contribution is caused by statistical effects, which are mainly due to the decreasing power of the radiation source used. We present an approach capable to reduce this contribution for the VIS/UVA-transition spectral range by means of a specially designed LED-based sphere radiation source.