bluuebunny/crossref_metadata_2025_split huggingface dataset:
Resonant phenomena in an all-dielectric rectangular circuit induced by a plane microwave
Authors: Shvartsburg A B , Pecherkin V Ya , Jiménez S , Vasilyak L M , Vázquez L , Vetchinin S P 
Published: October 2020

Abstract
Theoretical and experimental investigations of the main electromagnetic resonances excited by linearly polarized microwaves in a rectangular, thin, all-dielectric subwavelength circuit are presented. Displacement and polarization currents induced in this anisotropic circuit are shown to produce resonant magnetic and electric dipoles. The spectra of these dipoles measured in the near zone of the rectangular circuit frames indicate a variety of resonances subject to the orientation of the frame with respect to the polarization and directivity of the incident radiation. The frames arrangement in three orthogonal planes, normal respectively to the electric component, the magnetic component and the wave vector of the driving wave, illustrate the multitude of narrow polarization-dependent resonances, ensuring the inversion of magnetic inductance and electric displacement in the rectangular frame. These rectangular circuit frames can be used as a multiresonant dielectric metaelements.
A new signal denoising method based on double dictionary learning and moving ruler strategy
Authors: Ma Yunfei , Jia Xisheng 
Published: October 2020

Abstract
The denoising of vibration signals is useful with regards to various applications such as equipment monitoring. This study proposes a double dictionary learning method with a moving ruler strategy. The moving ruler strategy is used to construct a multi-layer and multi-position dictionary to reduce the gap between adjacent columns. However, the drawbacks of this strategy are high dictionary redundancy and reduced computation efficiency. Considering this issue, a double dictionary model is proposed combining the fixed dictionaries with learning dictionaries. The sparse coding and dictionary updating are improved correspondingly. Simulations demonstrate that the proposed method can outperform the existing denoising approaches. Moreover, an application of gearbox is presented to further validate the proposed method.
MEMS displacement generator for atomic force microscopy metrology
Authors: Babij M , Majstrzyk W , Sierakowski A , Janus P , Grabiec P , Ramotowski Z , Yacoot A , Gotszalk T 
Published: October 2020

Abstract
Atomic force microscopy enables three-dimensional high-resolution imaging of surfaces with nanoscale features. In order to obtain the quantitative information about surface geometry, the atomic force microscope’s scanning system must be calibrated. This is usually done by using calibration samples of known and/or defined shape based on either lithographic or crystal structures. In this work we report on a microelectromechanical device, referred to as a displacement generator, whose vertical deflection is controlled electronically. The designed, fabricated and applied device is formed out of a silicon nitride doubly clamped lever, referred to as a microbridge, with a deposited pair of platinum strips. When the MEMS displacement generator is immersed in a magnetic field and when it is electrically biased, the associated Lorentz force induces a structural displacement. In the presented design, the silicon nitride microbridges were fabricated on a (110) silicon wafer in a Wheatstone bridge configuration. A second reference cantilever was mechanically supported by the silicon substrate. In this way, a highly symmetrical structure was fabricated, making it possible to control precisely deflection in Z direction with sub-nanometre precision. The cantilever’s high resonance frequency, of ca. 500 kHz, makes the constructed device insensitive to external vibration sources which are typically at much lower frequencies. As the stage function can be described using the simple harmonic oscillator model, it is clear that the system can operate with sub-nanometre resolution, which, for the purpose of microscope calibration, is extremely beneficial. By placing of the atomic force microscope tip on the actuated reference device it is possible to determine the response of the system over a wide frequency bandwidth. In this work we will describe the fabrication process of the MEMS displacement generator, interferometric and traceable investigations of thermomechanical and electromagnetic actuation schemes. Moreover, we will present the results of the calibration of an atomic force microscope operating in contact and intermittent contact modes.
BiFeO3 nanoparticle doping effect on the growth and properties of Y–Ba–Cu–O superconductors
Authors: Li Guo-Zheng , Chen Chao , Wang Miao 
Published: October 2020

Abstract
The doping effect of BiFeO3 (BFO) nanoparticles on the growth and properties of Y–Ba–Cu–O (YBCO) superconductors by the powder melt and infiltration growth technique is investigated. The results indicate that nano-BFO doping reduces the growth rate of the Y-123 crystal and finally leads to smaller grain size in the YBCO bulk. Superconducting property measurements prove that improved levitation force and trapped field properties are observed in the 0.2 wt% BFO-doped YBCO sample. Magnetization measurement shows that the YBCO samples exhibit decreased T
c values with the increased BFO amount from 0.1 wt%–0.3 wt%, but the transition width ΔT
c shows no evident change. The sample with 0.2 wt% BFO addition presents the largest zero-field J
c value and also the highest secondary peak value, which accounts for the superior performance of the sample. The electron probe micro analysis results combined with the XRD analysis prove the decomposition of the BFO and formation of the YBi-2411 in the final bulk, while Fe element exists in the form of Fe/Cu substitutions. Thus, the simultaneous introduction and cooperation of the two types of flux pinning centers (i.e. non-superconducting inclusions and element substitutions) can be realized through the addition of nano-BFO.
An open-source 2D finite difference based transient electro-thermal simulation model for three-phase concentric superconducting power cables
Authors: de Sousa W T B , Shabagin E , Kottonau D , Noe M 
Published: October 2020

Abstract
Advances in superconductor technology make the prospect of economical operation of high temperature superconducting (HTS) power cables a practical concept for grid applications in urban centers. With more advanced cable designs being developed and commercialized, their geometrical features and dynamic behavior are becoming increasingly complicated to be modeled. This brings new challenges as the complex structure of HTS power cables significantly increases the computation power needed to perform simulations. In this paper we develop a two-dimensional open source simulation code based on the finite difference method which is solved by means of the alternating direction implicit routine. The algorithm has been written in MatLab programming language. The method improves computational performance and simulation time. In addition, this enables the creation of open-source simulation codes. A three-phase concentric HTS cable design has been chosen for the development of the code, nevertheless the model can be employed for any cable design. The results indicate an efficient, stable and powerful simulation code. During the development no numerical instabilities have been found. Besides that, the model is able to deliver quantities that are experimentally difficult to access. Simulation files are available for the scientific community on the HTS Modeling Workgroup webpage.
1

1
Simulation files can be downloaded.here.
Current limiting tests of a prototype 160 kV/1 kA resistive DC superconducting fault current limiter
Authors: Song Meng , Sheng Chao , Ma Tao , Huang Yong , Yang Chao , Xin Ying , Jin Hui , Yang Tianhui , Xiong Jialing , Li Chao , Li Quan , Wang Changqi , Li Bin , Xiao Leishi , Luo Pandian 
Published: October 2020

Abstract
High voltage direct current (HVDC) transmission technology has begun to play a great role in power transmission industry over the last decade. However, short-circuit fault seriously threatens the safety of an HVDC network. In order to reduce the fault current level of an HVDC network, utilizing a superconducting fault current limiter (SFCL) was proposed by researchers and engineers worldwide. Recently, Guangdong Grid Company of China Southern Power Grid, Co. has led a project to develop a 160 kV/1 kA resistive type DC SFCL. As a middle-step objective, a 160 kV/1 kA laboratory prototype has been developed. Due to a facility with an adequate capacity for testing such DC equipment is practically inaccessible, the current limiting performance of the prototype cannot be tested with a straightforward current limiting experiment. In practice, effectual alternative methods have to be adopted. Since the AC half-wave impact method requires less equipment and cost than the DC impact method, we took on an AC half wave impact current method to evaluate the current limiting function of the prototype alternatively. In this paper, we report the procedures and results of these tests.
Incorporating age and delay into models for biophysical systems
Authors: KhudaBukhsh Wasiur R , Kang Hye-Won , Kenah Eben , Rempała Grzegorz A 
Published: October 2020

Abstract
In many biological systems, chemical reactions or changes in a physical state are assumed to occur instantaneously. For describing the dynamics of those systems, Markov models that require exponentially distributed inter-event times have been used widely. However, some biophysical processes such as gene transcription and translation are known to have a significant gap between the initiation and the completion of the processes, which renders the usual assumption of exponential distribution untenable. In this paper, we consider relaxing this assumption by incorporating age-dependent random time delays (distributed according to a given probability distribution) into the system dynamics. We do so by constructing a measure-valued Markov process on a more abstract state space, which allows us to keep track of the ‘ages’ of molecules participating in a chemical reaction. We study the large-volume limit of such age-structured systems. We show that, when appropriately scaled, the stochastic system can be approximated by a system of partial differential equations (PDEs) in the large-volume limit, as opposed to ordinary differential equations (ODEs) in the classical theory. We show how the limiting PDE system can be used for the purpose of further model reductions and for devising efficient simulation algorithms. In order to describe the ideas, we use a simple transcription process as a running example. We, however, note that the methods developed in this paper apply to a wide class of biophysical systems.
A new measure of thermal micro-behavior for the AdS black hole *
Authors: Xu Zhen-Ming , Wu Bin , Yang Tao , Yang Wen-Li 
Published: October 2020

Abstract
Inspired by the hypothesis of the black hole molecule, with the help of the Hawking temperature, entropy, and the thermodynamic curvature of black holes, we propose a new measure of the relation between the interaction and the thermal motion of molecules of the AdS black hole as a preliminary and coarse-grained description. The proposed measure introduces a dimensionless ratio to characterize this relation and shows that there is indeed competition between the interactions of black hole molecules and their thermal motion. For a charged AdS black hole, below the critical dimensionless pressure, there are three transitions between the interaction and thermal motion states. In contrast, above the critical dimensionless pressure, only one transition takes place. For the Schwarzschild-AdS and five-dimensional Gauss-Bonnet AdS black holes, a transition always occurs between the interaction and thermal motion states.
Asymptotic structure of Einstein-Gauss-Bonnet theory in lower dimensions *
Authors: Lü H. , Mao Pujian 
Published: October 2020

Abstract
Recently, an action principle for the

limit of Einstein-Gauss-Bonnet gravity has been proposed. It is a special scalar-tensor theory that belongs to the family of Horndeski gravity. It also has well defined

and

limits. In this work, we examine this theory in three and four dimensions in the Bondi-Sachs framework. In both three and four dimensions, we find that there is no news function associated with the scalar field, which means that there is no scalar propagating degree of freedom in the theory. In four dimensions, the mass-loss formula is not affected by the Gauss-Bonnet term. This is consistent with the fact that there is no scalar radiation. However, the effects of the Gauss-Bonnet term are quite significant in the sense that they arise just one order after the integration constants and also arise in the quadrupole of the gravitational source.
Holographic Schwinger effect in a soft wall AdS/QCD model *
Authors: Ding Yue , Zhang Zi-qiang 
Published: October 2020

Abstract
We perform a potential analysis for the holographic Schwinger effect in a deformed

model with conformal invariance broken by a background dilaton. We evaluated the static potential by analyzing the classical action of a string attached to a rectangular Wilson loop on a probe D3 brane located at an intermediate position in the bulk AdS space. We observed that the inclusion of the chemical potential tends to enhance the production rate, which is opposite to the effect of the confining scale. In addition, we calculated the critical electric field based on the Dirac-Born-Infeld (DBI) action.
Strangeonium-like hybrids on the lattice *
Authors: Ma Yunheng , Chen Ying , Gong Ming , Liu Zhaofeng 
Published: October 2020

Abstract
The strangeonium-like

hybrids are investigated from lattice QCD in the quenched approximation. In the Coulomb gauge, spatially extended operators are constructed for

and

states with the color octet

component being separated from the chromomagnetic field strength by the spatial distance

, whose matrix elements between the vacuum and the corresponding states are interpreted as Bethe-Salpeter (BS) wave functions. In each of the

channels, the masses and the BS wave functions are reliably derived. The

ground state mass is approximately 2.1-2.2 GeV, and that of

is approximately 2.3-2.4 GeV, whereas the mass of the first excited state is approximately 1.4 GeV higher. This mass splitting is much larger compared to that expected based on the phenomenological flux-tube model or constituent gluon model for hybrids, which is usually a few hundred MeV. The BS wave functions with respect to

exhibit clear radial nodal structures of a non-relativistic two-body system, which imply that

is a meaningful dynamical variable for these hybrids and motivate a color halo picture of hybrids, in which the color octet

is surrounded by gluonic degrees of freedom. In the

channel, the properties of the lowest two states are consistent with those of

and

. We did not obtain convincing information with respect to

. However, we argue that regardless of whether

is a conventional

meson or a

hybrid in the color halo scenario, the ratio of partial decay widths

and

observed by BESIII can be understood based on the mechanism of hadronic transition of a strangeonium-like meson in addition to

mixing.
On-shell mediator dark matter models and the Xenon1T excess *
Authors: Du Mingxuan , Liang Jinhan , Liu Zuowei , Tran Van Que , Xue Yilun 
Published: October 2020

Abstract
We present a dark matter model to explain the excess events in the electron recoil data recently reported by the Xenon1T experiment. In our model, dark matter

annihilates into a pair of on-shell particles

, which subsequently decay into the

final state;

interacts with electrons to generate the observed excess events. Because of the mass hierarchy, the velocity of

can be rather large and can have an extended distribution, providing a good fit to the electron recoil energy spectrum. We estimate the flux of

from dark matter annihilations in the galaxy and further determine the interaction cross section, which is sizable but sufficiently small to allow

to penetrate the rocks to reach the underground labs.
Production of vector mesons in pentaquark state resonance channel in p-A ultraperipheral collisions *
Authors: Xie Ya-Ping , Wang Xiao-Yun , Chen Xurong 
Published: October 2020

Abstract
Ultraperipheral collisions (UPCs) of protons and nuclei are important for the study of the photoproduction of vector mesons and exotic states. The photoproduction of vector mesons in the pentaquark resonance channel in p-

UPCs at the Relative Heavy Ion Collider (RHIC) and p-

UPCs at the Large Hadron Collider (LHC) is investigated by employing the STARlight package. The cross sections of vector mesons via the pentaquark state resonance channel are obtained using the effective Lagrangian method. The pseudo-rapidity and rapidity distributions of

and

are given for p-

UPCs at the RHIC and p-

UPCs at the LHC. It is found that the RHIC is a better platform for discovering pentaquark states than the LHC. Moreover,

is easier to identify than

because the background of

is weaker than that of

in the t-channel at the RHIC.
Deuteron inelastic scattering on6Li and7Li nuclei within the three-body cluster model *
Authors: Egorov M. V. , Postnikov V. I. 
Published: October 2020

AbstractThe problem of the deuteron interaction with lithium nuclei, treated as a system of two coupled pointlike clusters, is formulated to calculate the cross sections of thed+Li reaction. Thed+Li reaction mechanism is described using the Faddeev theory for the three-body problem of deuteron-nucleus interaction. This theory is slightly extended for calculation of the stripping processes6Li(d,p)7Li,7Li(d,p)8Li,6Li(d,n)7Be, and7Li(d,n)8Be, as well as fragmentation reactions yielding tritium,-particles, and continuous neutrons and protons in the initial deuteron kinetic-energy regionMeV. The phase shifts found forLi andLi elastic scattering, as part of the simple optic model with a complex central potential, were used to find the cross sections for the6Liand7Liradiation captures. The three-body dynamics role is also summarized to demonstrate its significant influence within theLi system.
Diffusion MRI tractography filtering techniques change the topology of structural connectomes
Authors: Frigo Matteo , Deslauriers-Gauthier Samuel , Parker Drew , Aziz Ould Ismail Abdol , John Kim Junghoon , Verma Ragini , Deriche Rachid 
Published: October 2020

Abstract

Objective. The use of non-invasive techniques for the estimation of structural brain networks (i.e. connectomes) opened the door to large-scale investigations on the functioning and the architecture of the brain, unveiling the link between neurological disorders and topological changes of the brain network. This study aims at assessing if and how the topology of structural connectomes estimated non-invasively with diffusion MRI is affected by the employment of tractography filtering techniques in structural connectomic pipelines. Additionally, this work investigates the robustness of topological descriptors of filtered connectomes to the common practice of density-based thresholding. Approach. We investigate the changes in global efficiency, characteristic path length, modularity and clustering coefficient on filtered connectomes obtained with the spherical deconvolution informed filtering of tractograms and using the convex optimization modelling for microstructure informed tractography. The analysis is performed on both healthy subjects and patients affected by traumatic brain injury and with an assessment of the robustness of the computed graph-theoretical measures with respect to density-based thresholding of the connectome. Main results. Our results demonstrate that tractography filtering techniques change the topology of brain networks, and thus alter network metrics both in the pathological and the healthy cases. Moreover, the measures are shown to be robust to density-based thresholding. Significance. The present work highlights how the inclusion of tractography filtering techniques in connectomic pipelines requires extra caution as they systematically change the network topology both in healthy subjects and patients affected by traumatic brain injury. Finally, the practice of low-to-moderate density-based thresholding of the connectomes is confirmed to have negligible effects on the topological analysis.
Nanoscale water film at a super-wetting interface supports 2D material transfer
Authors: Zhao Xiao-kang , Chen Ruo-wang , Xu Kang , Zhang Si-yuan , Shi Hui , Shao Zhi-yong , Wan Neng 
Published: October 2020

Abstract
We observed a super-wetting behavior at typical chemical vapor deposition grown transition metal di-chalcogenide (TMDC) 2D material–substrate interface. Such an interface was found to keep a flat, nanoscale water film when interacting with liquid state water. Detailed in situ atomic force microscope studies found the variable thickness of the water layer. Both surfaces at the two sides of the interface, viz. the TMDC (MoS2 or WS2 as demonstrated) bottom surface and the exposed substrate (typically, the as-grown SiO2) surface, were found to be super-wetting. This insured effectively their stable super-wetting behaviors. We further verified a prompt relationship of the nanoscale water layer with the water-mediated transfer of the TMDC. The super-wetting layer was found essential and critical for the effective transfer of TMDCs to other surfaces.
Thermal and electrical conductivity of single crystalline kesterite Cu2ZnSnS4
Authors: Handwerg M , Mitdank R , Levcenco S , Schorr S , Fischer S F 
Published: October 2020

Abstract
For single crystalline sulfur-based kesterite Cu2ZnSnS4 the electrical and thermal conductivity are measured from 20 K to 320 K. The electrical conductivity decreases exponentially with decreasing temperature. The temperature dependence can be assigned to Mott-variable-range-hopping, an electrical transport process within an impurity band in the band gap. With the 3ω-method a thermal conductivity room temperature value of 5.1 ± 0.5 Wm−1K−1 and a maximal value of 8.0 ± 0.5 Wm−1K−1 at 100 K are found. Phonon-phonon-umklapp-scattering can explain the high temperature range from 100 K to 320 K. The low temperature values of the thermal conductivity are dominated by the temperature-dependence of the specific heat capacity, due to a reduced phonon-mean-free-path, owing to phonon-impurity-scattering.
Fabrication and analysis of mechanical properties of PVC/Glass fiber/graphene nano composite pipes
Authors: Shanmugasundar G , Vanitha M , Babu L Ganesh , Suresh P , Mathiyalagan P , Krishnan G Sai , Makos Mebratu 
Published: October 2020

Abstract
The aim of this work is to examine the conventional moulding method for manufacturing the PVC/Glass fiber/graphene nano composites. Uniform graphene dispersion is observed with the matrix for better bonding. The Mechanical properties of the manufactured nano composites have been done in this work. Three important standard tests were evaluated for the performance of Nano-Composites developed. The composites were developed as flat specimen for pipe applications. The three standards test which includes axial tension, compression and transverse compression is studied. The graphene nano composites were varied 0.5%, 1%, 1.5% and 2 percentages. Based on the results it can be concluded that the increase in the percentages of graphene made a uniform dispersion, which leads to increase in the compressive strength of the Nanocomposite. Increase in the axial compressive strength and stiffness was observed and the increase in the trend value is mainly observed in 1.5 wt% and 2 wt% respectively. The Graphene dispersion and fractured surface morphology of nano composites were examined using scanning electronic microscopy (SEM).It can also be used as an alternative for metal pipes in industries.