bluuebunny/crossref_metadata_2025_split huggingface dataset:
Patienten mit ersten Anzeichen nachlassender geistiger Leistungsfähigkeit: Was der Hausarzt nicht vergessen sollte
Authors: Emmrich Peter 
Published: February 2023

ZusammenfassungNoch immer wird die leichte kognitive Störung zu selten diagnostiziert und ärztlich behandelt. Dabei haben Forschungen der letzten Jahre gezeigt, dass verschiedene Maßnahmen das Risiko nachlassender geistiger Leistungsfähigkeit und einer eventuellen sukzessiven Demenzerkrankung mindern können. Erste Gedächtnisverluste, Verhaltensänderungen oder neuropsychiatrische Störungen im Alter sollte der Arzt nicht nur mit dem Ziel ernst nehmen, weitere Einbußen zu verzögern. Vielmehr können Patienten lange vor demenziellen Stadien bereits unter diesen Beeinträchtigungen leiden. Zu den modifizierbaren Risikofaktoren für Demenzen zählen u. a. Hörverlust, Bluthochdruck, übermäßiger Alkoholkonsum, Übergewicht, Rauchen, Depressionen, Einsamkeit, körperliche Inaktivität und Diabetes. Zur symptomatischen Behandlung altersbedingter kognitiver Beeinträchtigungen und demenzieller Erkrankungen trägt der Ginkgo-biloba-Extrakt EGb 761 bei. Aufgrund der guten Verträglichkeit von EGb 761 empfiehlt sich daher der frühzeitige Einsatz im Rahmen eines ganzheitlichen Therapiekonzepts.
Update Motorisches Lernen (1) Definitionen – Unterscheidungen – Theorien
Authors: Steck Gail Cox , Janssen Christina 
Published: February 2023

ZusammenfassungDer nachfolgende erste Beitrag stellt Definitionen, Unterscheidungen und Theorien dar. Der zweite Beitrag (► Seite 22) erläutert das „Lernrad“ zum Prozess und die strukturierte Anwendung des motorischen Lernens in der Praxis. Der dritte Artikel vermittelt Beispiele für lernfördernde Instruktionsarten (► Seite 24).
The analysis of hot deformation behaviour of low-cost α+β Ti-6Al-0.4V-1.2Fe alloys
Authors: Wan Guilin , Ren Zhihao , Guo Yanhua , Sun Zhonggang , Chang Hui 
Published: February 2023

The low-cost Ti-6Al-0.4V-1.2Fe alloy was subjected to isothermal compression experiments on the Gleeble 3800, and the deformation temperature was 775°C∼975°C and the strain rate was 0.01 s−1∼10 s−1. Based on the experimental data on thermal deformation, the microstructure evolution was studied and the constitutive equation was developed. The experimental results show that the flow stress increased with increasing deformation temperature and with the increase of the strain rate; the optimal deformation temperature of Ti-6Al-0.4V-1.2Fe alloy is 820°C∼950°C, and the strain rate is 0.01 s−1∼0.32 s−1; During hot deformation, the primary softening mechanism of this alloy is continuous dynamic recrystallisation. Compared with Ti-6Al-4V, the Ti-6Al-0.4V-1.2Fe alloy has better hot workability and better plasticity. Highlights A newly low-cost Ti-6Al-0.4V-1.2Fe alloy was designed based on the Kβ stability coefficient method, and the β stability coefficient was the same as that of Ti-6Al-4V. A study on the microstructure evolution in the process of hot deformation between Ti-6Al-0.4V-1.2Fe and Ti-6Al-4V alloys. A study on microstructure evolution and hot working process of a newly low-cost Ti-6Al-0.4V-1.2Fe alloy.
Lagrange-mesh calculations of P-wave resonances in three-body atomic systems
Authors: Servais Jean , Dohet-Eraly Jérémy 
Published: February 2023

Abstract
The resonance energies and widths of the P-wave states of helium and of the positronium ion are studied under the hypothesis that their constituting particles interact trough pure or screened Coulomb forces. The resonances are investigated by combining the Lagrange-mesh method and the complex scaling method. This approach is proved to be efficient: rather simple to implement, fast, and accurate. The obtained results improve by several orders of magnitude the best literature results.
Determination and assessment of a complete and self-consistent electron-neutral collision cross-section set for the C4F7N molecule
Authors: Zhang Boya , Hao Mai , Yao Yuyang , Xiong Jiayu , Li Xingwen , Murphy Anthony B , Sinha Nidhi , Antony Bobby , Ambalampitiya Harindranath B 
Published: February 2023

Abstract
The perfluoronitrile C4F7N is considered a promising SF6-alternative in high-voltage gas-insulated apparatus, thanks to its high dielectric strength and low global warming potential. However, a complete and consistent set of electron-neutral collision cross-sections of C4F7N is still lacking, which hinders relevant plasma modeling. In this contribution, the available electron-neutral collision cross-sections of C4F7N are first compiled and assessed. The initial cross-sections are adjusted iteratively by the electron swarm method to determine a complete and self-consistent cross-section set of C4F7N for the first time. The set is validated by a systematic comparison of electron swarm parameters between Boltzmann equation analysis and experimental measurements in pure C4F7N as well as C4F7N/N2 and C4F7N/Ar mixtures. The proposed cross-section set of C4F7N will be made available to the community in the LXCat database. It will be of particular importance for applications with an emphasis on the discharge mechanisms of this novel gas.
Ultra-compact active induced-magnetism Huygens’ metasurfaces: design and application
Authors: Qiu Chunqiao , Xue Chunhua , Yuan Luxi , Li Feng , Xu Quan , Zhu Hongyu , Li Quan , Zhang Zhengren 
Published: February 2023

Abstract
Recently, a new type of metasurface, the induced-magnetism Huygens’ metasurface, has attracted considerable attention due to its capability to manipulate electromagnetic waves. However, these studies mainly work in a passive way such that the functionalities are fixed once fabricated, limiting the device’s adaptability for practical applications and future commercialization. To comply with potential applications, further research endeavors need to be exerted to advance the reconfigurability and practicality. Herein, an ultra-compact and dynamically tunable design strategy of an induced-magnetism Huygens’ metasurface is proposed, whose basic unit is a pair of electric dipoles separated by a dielectric spacer and integrated with a varactor in each electric dipole. By simply changing the driven voltage of each unit, the transmission phase can be individually tuned in the near 2π range; meanwhile, the transmission amplitude remains very high. As a proof-of-concept demonstration, an active magnetism induced Huygens’ meta-lens is proposed to exhibit excellent dynamic wavefront manipulation performance. The proposed method may open an avenue toward planar lightweight low-cost dynamic wavefront manipulation devices.
Borel–Laplace sum rules with τ decay data, using OPE with improved anomalous dimensions
Authors: Ayala César , Cvetič Gorazd , Teca Diego 
Published: February 2023

Abstract
We perform numerical analysis of double-pinched Borel–Laplace QCD sum rules for the strangeless semihadronic τ-decay data. The D = 0 contribution to the theoretical contour integral in the sum rules is evaluated by the (truncated) Fixed Order perturbation theory method (FO) and by the Principal Value (PV) of the Borel integration. We use for the full Adler function the operator product expansion (OPE) with the terms ∼〈O

D
〉 of dimension D = 2n where 2 ≤ n ≤ 5 for the (V+A)-channel, and 2 ≤ n ≤ 7 for the V-channel data. In our previous works Ayala, Cvetič and Teca (2021, Eur. Phys. J. C
81 930), Ayala, Cvetič and Teca (2022, Eur. Phys. J. C
82 362), only the (V+A)-channel data was analysed. In this work, the analysis of a new set of V-channel data is performed as well. Further, a renormalon-motivated construction of the D = 0 part of the Adler function is improved in the u = 3 infrared renormalon sector, by involving the recently known information on the two principal noninteger values

k

(
j
)

=

γ

(
1
)

(

O

6

(
j
)

)

/

β

0

of the effective leading-order anomalous dimensions. Additionally, the OPE of the Adler function has now the D = 6 contribution with the principal anomalous dimension (

∼

α

s

k

(
1
)

), and terms of higher dimension (with zero anomalous dimension). Cross-checks of the obtained extracted values of α

s
and of the condensates were performed by reproduction of the (central) experimental values of several double-pinched momenta a
(2,n). The averaged final extracted values of the (

MS

¯

) coupling are:

α

s

(

m

τ

2

)
=

0.3169

−
0.0096

+
0.0070

, corresponding to

α

s

(

M

Z

2

)
=

0.1183

−
0.0012

+
0.0009

.
Using measurement uncertainties to detect incomplete assumptions about theory in an experiment with rolling marbles
Authors: Kok Karel , Priemer Burkhard 
Published: February 2023

Abstract
In this lab activity, carbon copy paper is used to record the horizontal distance a marble flies off a table after rolling down an incline. The minimal scatter of the dots visually shows the high precision—i.e. the small uncertainty—of the measurements to students. The theoretical prediction of this distance will be too big if students forget to include rotational energy in the energy balance when they calculate the marble’s speed at the bottom of the incline. This results in a discrepancy between the predicted horizontal distance and the measurement result. The precision of the experiment and the absence of overlap with the theoretical prediction is evidence that the prediction has to be wrong. Including rotational energy and taking a 10% energy loss due to friction into account, makes the measurement result overlap with the theoretical prediction, bringing them into agreement. Thus, measurement uncertainties guide the process of comparing the measurement result with the prediction: overlap between the theory-based prediction and the measurement result indicates agreement, whereas no overlap implies discrepancy. The lab activity presented here is an activity where measurement uncertainties are used in a meaningful, indispensable manner. The experimental result is evidence that forces students to rethink their assumptions, in this case about the conservation of energy. This leads to the revision of their calculation, emphasizing the necessity to include rotational energy and friction. Without it, the highly precise measurement result is in disagreement with the theoretical prediction. A procedure such as this—comparing empirical data with theory—is an authentic and common practice in science and should thus find its way into the physics classroom; but it cannot be done without an analysis of measurement uncertainties.
Development of fiber-based piezoelectric sensors for the load monitoring of dynamically stressed fiber-reinforced composites
Authors: Le Xuan Hung , Haentzsche Eric , Nocke Andreas , Tran Nguyen Hoai An , Kruppke Iris , Cherif Chokri 
Published: February 2023

Abstract
Continuous load monitoring of fiber-reinforced composites represents a complex challenge for the composite sector. In this paper, the development and characterization of piezoelectric sensors for structural health monitoring applications based on polyvinylidene fluoride (PVDF) are presented. The basic sensor structures are melt spun bicomponent filaments in a core-sheath configuration. The core is a volumetric mixture of polypropylene (PP) and Pre-Elec PP, a PP-compound modified with carbon black. The sheath is made of PVDF. Three variants with increasing volumetric Pre-Elec ratio in the core (50 vol.%, 60 vol.% and 70 vol.%) are manufactured and analyzed by conducting optical and resistance measurements as well as tensile tests. In the subsequent process step, the bicomponent filaments are braided with copper fine wires. The PP core and copper braiding of the coaxial tricomponent yarn are used as inner and outer electrode, respectively. By generating an electrostatic high voltage field between these electrodes, the PVDF interlayer is subjected to contact polarization to initialize the piezoelectric effect. The piezoelectric characteristics and thereby the sensory potential of the produced sensor yarns are quantified and analyzed on the fiber and composite scale by investigating their piezoelectric behavior during cyclic tensile tests. The results of the different sensor yarn variants are compared with each other by evaluating the measured voltage signal as a function of the induced cyclic stresses.
Drying-freeing preparation and property tests on MR fluid with MWCNTs/GO-coated CI particles
Authors: Xu Zhao-Dong , Zhou Shu , Yang Yang , Guo Ying-Qing 
Published: February 2023

Abstract
The traditional preparation processes for magnetorheological (MR) fluids are complicated and time-consuming, and cannot guarantee the performance of the prepared material, especially for the MR fluid with mixed coated particles. In this study, an improved drying-free preparation method of MR fluids was proposed, which adopts the magnetic separation technology to replace the traditional drying process, and an integrated preparation device for preparing MR fluids was designed on this basis to realize high efficiency and automation. The MR fluid with multiwalled carbon nanotube/graphene oxide-coated carbonyl iron particles was prepared using the designed device, and the test results showed that the drying-free preparation process can save 1/3 of the original preparation time. Then, the zero-field viscosity, yield shear stress and sedimentation rate of the prepared MR fluid were tested and compared with those prepared by the manual preparation methods. Under appropriate proportion of ingredients, the MR fluid prepared by the drying-free process has higher yield shear stress and better sedimentation stability. Therefore, the drying-free preparation process and the integrated preparation device proposed in this study are not only efficient and automated, but also can improve the performance of MR fluids.
Time-variant magnetic field, voltage, and loss of no-insulation (NI) HTS magnet induced by dynamic resistance generation from external AC fields
Authors: Zhong Zhuoyan , Wu Wei , Lu Li , Shen Boyang , Dong Fangliang , Wang Longbiao , Hong Zhiyong , Jin Zhijian 
Published: February 2023

Abstract
High-temperature superconducting (HTS) coils serving as DC magnets can be operated under non-negligible AC fields, like in synchronous machines of maglev trains and wind turbines. In these conditions, dynamic resistance is generated in HTS tapes, causing redistribution/bypassing of the transport current inside the no-insulation (NI) coil and its unique operational features. This issue was studied by experiments on an NI coil with DC current supply put into external AC fields. Due to the current redistribution induced by dynamic resistance, the central magnetic field and voltage of the NI magnet initially undergo various transient processes, and eventually exhibit a stable central magnetic field reduction and a DC voltage. These time evolutions have implications for the time-varying torque and loss of an HTS machine. These time evolutions are strongly affected by the contact resistivity distribution, and whether it is the first time that the NI magnet has been exposed to the AC field, showing several qualitatively different waveforms (e.g. some are even non-monotonic with time). The magnitudes of the stable central field reductions, and their observed linear correlation with the DC voltages are found to be decided by the local contact resistivity of the innermost and outermost several turns. It is also noted that the non-insulated turn-to-turn contact help lessening the loss induced by the dynamic resistance. A numerical model is established to analyze/explain these experimental results by observing the microscopic current distribution. Two risks of quench are noticed: (i) the azimuthal current of the middle part turns increases as the AC field is applied; (ii) a concentration of radial current is observed near the terminals of the NI coil.
On the uniqueness of Einstein-Cartan theory: Lagrangian, covariant derivative and equation of motion
Authors: Chen Zi-Wei , Diao Run , Chen Xiang-Song 
Published: February 2023

Abstract
In the standard Einstein-Cartan theory, matter fields couple to gravity through the Minimal Coupling Procedure (MCP), and yet leave the theory an ambiguity. Applying MCP to the action or to the equation of motion would lead to different gravitational couplings. We propose a new covariant derivative to remove the ambiguity and discuss the relation between our proposal and previous treatments on this subject.
Calibration of GNSS stations for UTC
Authors: Petit Gérard , Defraigne Pascale 
Published: February 2023

Abstract
Global navigation satellite system (GNSS) time transfer has been used for four decades in the generation of universal time coordinated (UTC), starting with GPS in the 1980s. Calibration of GNSS receivers is then essential to ensure that time links used in UTC are accurate and remain stable with time. In this paper we study the different calibration schemes based on relative calibration of GNSS receivers that have been operated to fulfill these goals. We specially focus on the current calibration scheme in operation since 2014 and based on a collaboration between the BIPM and the Regional Metrology Organizations. We show that the achieved accuracy and long-term stability of calibration results, thus of UTC time links, are well in line with the stated uncertainties. We study an extended set of absolute calibration results and show that they complete and validate the BIPM scheme, and that relative calibration is still the essential tool to ensure accurate time links for UTC.
Wind Speed Power Data Cleaning Method for Wind Turbines Based on Fan Characteristics and Isolated Forests
Authors: Lai Gang , Liao Li , Zhang Liang , Li TianYi 
Published: February 2023

Abstract
To address the situations that wind turbine operating conditions are complex and variable, the wind speed and power data are confusing, and there are many anomalies with significant differences, which make data analysis difficult, a method of cleaning wind speed and power data of wind turbines based on turbine characteristics and isolated forests is established. Firstly, the wind turbine power data is initially screened with the actual wind turbine characteristics. Then, isolated trees are constructed based on the initial filtered data. Afterward, the built isolated trees are used to calculate the power anomalies to be cleaned and to distinguish the anomalies, which finally achieves effective and efficient data cleaning. The experimental analysis results with the actual unit data of a wind farm show that this method is more efficient and more general than that of the traditional cleaning methods.
Embedded-based Thermal Expansion Meter Test System Design
Authors: Liu Yutao , Yang Shifeng , Shui Guang 
Published: February 2023

Abstract
In order to realize the intelligent test of thermal expansion, the overall design scheme of the thermal expansion test system is given, the test platform of the thermal expansion test system is constructed, and the single-neuron PID control algorithm is used to control the heating rate of the electric furnace by using the microcontroller, the upper computer software is written by using Python, the data transmission between the upper computer and the microcontroller is made through the software, and the real-time acquisition of temperature and displacement signals is realized. The software enables data transfer between the upper computer and the microcontroller, real-time acquisition, storage, and analysis of temperature and displacement signals, and it is able to meet the requirements of practical engineering tests.
Low-carbon Electricity Consumption Mechanism Considering the Interaction and Coordination of Source and Charge
Authors: Xu Hezhong , Xu Mingfeng , Hui Chengxuan , Lv Zeming , Liu Zhiping , Wang Mingyu , Weng Xiaochong 
Published: February 2023

Abstract
With the increasing shortage of traditional energy and environmental pollution, the “double carbon” goal was put forward. The construction of a new power system is an important way to achieve this goal, and how to maximize the consumption of new energy under the interaction and coordination of source and charge is the focus of this paper. Through discussing the new development trend of the present situation in the construction of electric power systems and the source charge interaction, the theoretical foundation is established to promote low-carbon electricity given the source of the collaborative optimization model. Then, the power grid company’s profit is maximized by considering the source charge interactive coordination. Finally, the process is optimized to establish the objective function and variables of the scope of the restrictions, so as to ensure the improvement and construction of the low-carbon electricity consumption mechanism.
Distribution network reconfiguration control and protection method based on multi-source data interaction
Authors: Yu Zhihao , Shou Shaoan , Wang Yuanxing , Wang Dengqing , Lu Xiang , Ma Chunsheng 
Published: February 2023

Abstract
Distribution network reconfiguration technology is the key technology of distribution network fault treatment and power supply recovery. Given the problem that the traditional distribution network reconfiguration algorithm needs a lot of power flow calculation and low efficiency to find the optimal target, the simulated annealing algorithm is proposed to optimize the computing speed and searching ability of the distribution network reconfiguration algorithm. Firstly, the information interaction technology of distribution network protection and control equipment is studied, and the real-time data rapid peer-to-peer exchange and data and information interaction model is built, which improves the fault detection and timely removal ability of the distribution network. Secondly, the simulated annealing algorithm is used to reduce the number of power flow calculations, reduce the calculation time, improve the calculation speed of network reconstruction problems, and ensure that the optimal or better network topology can be obtained. Finally, the simulation analysis of the IEEE37 node system verifies the effectiveness of the proposed reconfiguration protection method in a complex environment with massive access to distributed energy.
Separation of Urban Substation Noise and Environmental Noise based on Independent Component Analysis
Authors: Xu Luwen , Qiu Ni , Yang Bo , Peng Shiwei 
Published: February 2023

Abstract
With the development of urbanization, substations have started to be established in urban areas where the population is concentrated. To realize effective control of the substation noise, accurate measurements of the noise inside the substation and the surrounding area are necessary. However, in an urban area, the background noise, such as traffic noise, causes the sampled signals to contain not only the substation noise but also the background noise, which decreases the measurement accuracy. Thus, separating the substation noise from the environmental background noise is necessary. An independent component analysis method is used to realize the separation of the substation noise from complex environmental noises. In this paper, two typical environmental noises are selected, and their characteristics and the urban substation noise are analyzed. Then, a separation method based on the independent component analysis is constructed for separating substation noise. Its accuracy is evaluated using measured mixed signals. The verification shows that the separated substation noise is very close to the original substation noise signal, which shows that the method can be used in practical substation noise control engineering applications.