bluuebunny/crossref_metadata_2025 huggingface dataset:
Singular symplectic cotangent bundle reduction of gauge field theory
Authors: Diez Tobias , Rudolph Gerd
Published: September 2020

We prove a theorem on singular symplectic cotangent bundle reduction in the Fréchet setting and apply it to Yang–Mills–Higgs theory with special emphasis on the Higgs sector of the Glashow–Weinberg–Salam model. For the latter model, we give a detailed description of the reduced phase space and show that the singular structure is encoded in a finite-dimensional Lie group action.
Validation of finite element analysis strategy to investigate acoustic levitation in a two-axis acoustic levitator
Authors: Sracic Michael W. , Suthar Kamlesh J.
Published: September 2020

A two-axis acoustic levitator can be used to generate a standing pressure wave capable of levitating solid and liquid particles at appropriate input conditions. This work proposes a simulation framework to investigate the two-axis levitation particle stability using a commercial, computational fluid dynamics software based on the harmonic solution to the acoustic wave equation. The simulation produced predictions of the standing wave that include a strong “+” shaped pattern of nodes and anti-nodes that are aligned with the levitator axes. To verify the simulation, a levitator was built and used to generate the standing wave. The field was probed with a microphone and a motorized-scanning system. After scaling the simulated pressure to the measured pressure, the magnitudes of the sound pressure level at corresponding high-pressure locations were different by no more than 5%. This is the first time a measurement of a two-axis levitator standing pressure wave has been presented and shown to verify simulations. As an additional verification, the authors consulted high speed camera measurements of a reference-levitator transducer, which was found to have a maximum peak-to-peak displacement of 50 ± 5 μm. The reference-levitator is known to levitate water at 160 dB. The system for this work was simulated to match the operation of the reference-levitator so that it produced sound pressure levels of 160 dB. This pressure was achieved when the transducer maximum peak-to-peak displacement was 50.8 µm. The agreement between the two levitators’ displacements provides good justification that the modeling approach presented here produces reliable results.
Comprehensive study of monatomic fluid flow through elliptical carbon nanotubes
Authors: Rezaee Mohammad , Namvarpour Mohammad , Yeganegi Arian , Ghassemi Hojat
Published: September 2020

To achieve a realistic model of a carbon nanotube (CNT) membrane, a good understanding of the effects associated with CNT deformations is a key issue. In this study, using molecular dynamics simulation, argon flow through elliptical CNTs is studied. Two armchair CNTs (6, 6) and (10, 10) were considered. The results demonstrated non-uniform dependency of the flow rate to eccentricity of the tube, leading to an unexpectedly increased flow rate in some cases. The effects of tube size, temperature, and pressure gradient are investigated, and longitudinal variations of the interatomic potential and average axial velocity in different segments of the cross section are presented to justify the abnormal behavior of the flow rate with eccentricity. The results showed a significant deviation from the macroscale expectations and approved elliptical deformation as a non-negligible change in the overall flow rate, which should be considered in predictive models of CNT membranes.
Dynamics of large-scale circulation and energy transfer mechanism in turbulent Rayleigh–Bénard convection in a cubic cell
Authors: Vishnu Venugopal T. , De Arnab K. , Mishra Pankaj K.
Published: September 2020

We present the characteristics and dynamics of large-scale circulation (LSC) in turbulent Rayleigh–Bénard convection (RBC) inside a cubic cell. The simulations are carried out for a Rayleigh number range of 2 × 106 ≤ Ra ≤ 109 and using air (at Prandtl number Pr = 0.7) as the working fluid. Using the Fourier mode analysis, the strength, orientation, and associated dynamics of LSC are characterized. Following previous two-dimensional studies in RBC, we propose a mechanism of flow reversals based on the dynamics of corner vortices, which is less attempted in three-dimensional counterparts. We observe that the plane containing LSC is generally aligned along one of the diagonals of the box accompanied by a four-roll structure in the other. In addition to the primary roll, two secondary corner-roll structures are also observed in the LSC plane, which grow in size and destabilize the LSC, resulting in partial (ΔΦ1 ≈ π/2) and complete (ΔΦ1 ≈ π) reversals. In addition to previously reported rotation-led reorientations, we also observe cessation events that are rare in cubic cells. We observe that as the Rayleigh number is increased from Ra = 2 × 106 to 107, the number of reorientations reduces by one third. With an increase in Ra, the strength of LSC (SLSC) increases and the corner rolls reduce in size, which leads to the reduction in the occurrence of reorientations. At higher Rayleigh numbers (Ra > 108), the strength saturates around SLSC ≈ 0.75. To connect the dynamics between different coherent structures, we evaluate the turbulent kinetic energy (TKE) budget. Notably, our novel approach to study the variation of TKE along the azimuthal direction helps in identifying the dynamical coupling between the LSC and non-LSC planes. The analysis suggests that TKE is generally produced in localized regions in both the planes, while its dissipation mainly happens in the vicinity of the plane that contains LSC. The transport mechanism redistributes the energy between these planes and thus sustains the LSC and other coherent structures.
Hierarchical structure is employed by humans during visual motion perception
Authors: Bill Johannes , Pailian Hrag , Gershman Samuel J. , Drugowitsch Jan
Published: September 2020

Significance

The structured organization of motion in visual scenes is highly informative for our everyday perception: We recognize people by the way they walk, track objects through occlusion, or predict hazardous situations from the traffic flow. It is, however, unclear how our minds tame the overwhelmingly complex stream of dynamic information received by the retina to form such stable percepts. We argue that an observer can exploit a “divide-and-conquer” strategy where complex motion relations are broken down into compositions of simpler motions. Evidence for hierarchical decomposition comes from multiple object tracking and prediction experiments in which humans are able to exploit motion structure knowledge to improve performance. Our results can guide neuroscience experiments on the neural representation of structure.
Introduction to the templatic verb morphology of Birhor (Birhoɽ), a Kherwarian Munda language
Authors: Anderson Gregory D. S. , Jora Bikram
Published: September 2020

Birhor (Birhoɽ) is a Kherwarian Munda language spoken in small enclaves in India, primarily in Hazaribagh, Ranchi, and Singhbhum districts and other small pockets in Jharkhand state. Birhor has to date been poorly documented, and even the basic properties of its core grammatical systems remain largely undescribed. All data used in this study come from field notes collected in several trips dating back to 2015. This paper is a preliminary attempt to identify the basic templatic structures of positive and negative finite conjugations in Birhor of both monovalent and polyvalent predicates. We discuss here two basic intersecting inflectional oppositions in the grammar of Birhor: (i) between perfective and imperfective tense-aspect forms (the imperfective includes imperfective and imperfect forms, and the perfective includes the past, the anterior and the perfect); and (ii) between monovalent predicates and polyvalent ones. Like all Kherwarian languages, Birhor has a nominative-accusative alignment of argument indexing and a complex templatic verb structure. It encodes subjects with monovalent stems. Polyvalent predicates encode two arguments, a first argument/syntactic subject and a second argument/syntactic ‘object’ following a primary object pattern. A complex array of different templates is thus found across positive and negative conjugations that contrast polyvalent vs. monovalent imperfective, perfective, and imperative forms. Many different formal templatic patterns are attested within each of the paradigmatic oppositional sets in Birhor. There are two formal subtypes of monovalent predicates. They contrast in both positive and negative conjugations, for both the imperfective and the perfective series of inflections. Polyvalent predicates also contrast the imperfective and the perfective series. Lastly, there are distinct templates for imperative and prohibitive of monovalent and polyvalent predicates as well.
Recovering a potential in damped wave equation from Neumann-to-Dirichlet operator
Authors: Romanov Vladimir , Hasanov Alemdar
Published: September 2020

The inverse coefficient problem of recovering the potential q(x) in the damped wave equation

m

(

x

)

u

t
t

+
μ

(

x

)

u

t

=

r

(

x

)

u

x

x

+
q

(

x

)

u

, (x, t) ∈ Ω
T
≔  (0, ℓ) × (0, T) subject to the boundary conditions r(0)u

x
(0, t) = f(t), u(ℓ, t) = 0, from the Dirichlet boundary measured output ν(t) ≔ u(0, t), t ∈ (0, T] is studied. A detailed microlocal analysis of regularity of the direct problem solution in the subdomains defined by the characteristics as well as along these characteristics is provided. Based on this analysis, necessary regularity results and energy estimates are derived. It is proved that the Dirichlet boundary measured output uniquely determines the potential q(x) in the interval [0, h(T/2)] and this solution belongs to C(0, h(T/2)) with T < T*, where h(z) is the root of the equation

z
=

∫

0

h

(

z

)

m

(

x

)

/
r

(

x

)

d
x

,

T

*

=
2

∫

0

ℓ

m

(

x

)

/
r

(

x

)

d
x

. Moreover, the global uniqueness theorem is proved. Compactness, invertibility and Lipschitz continuity of the Neumann-to-Dirichlet operator

Φ

f

[

⋅

]

:
Q
⊂
C

(

0
,
ℓ

)

↦

L

2

(

0
,
T

)

, Φ
f
[q](t) ≔ u(0, t; q) is proved. This allows us to prove an existence of a quasi-solution of the inverse problem defined as a minimum of the Tikhonov functional

J

(

q

)

≔

(

1
/
2

)

‖

Φ

f

[

⋅

]

−
ν

‖

L

2

(

0
,
T

)

2

as well as its Fréchet differentiability. An explicit formula for the Fréchet gradient is derived by making use of the unique solution to corresponding adjoint problem. The proposed approach is leads to very effective gradient based computational identification algorithm.
Magneto-optical transmission in magnetic nanoparticle suspensions for different optical applications: a review
Authors: Jing Dengwei , Sun Le , Jin Jingyu , Thangamuthu Madasamy , Tang Junwang
Published: September 2020

Recently, the magneto-optical properties of magnetic nanofluids have received increasing attention due to their wide range of applications in solar energy conversions and also as smart fluids in tunable photonic devices, optical switch, optical fiber sensor, etc. This review discusses up-to-date developments in magneto-optical transmission in ferrofluids. The magnetic nanoparticle would undergo various structural transitions under external magnetic field, including chainlike formation and lateral coalescence which, in turn, leads to various interesting light transmission phenomena. It is thus possible to alter the properties of the transmitted light by adjusting the orientation of the magnetic field with respect to that of the incident light. The polarization direction of light has a negligible effect on the magneto-optical transmission while light passing along the magnetic field. However, it makes a significant difference for light normal to the field direction. These characteristics are comprehensively reviewed, and their potential applications are presented. It is supposed to provide a general view on the research trends, existing problems and future work for the investigation of magneto-optical transmission in magnetic nanofluids.
A study on the effect of film crystallinity and morphology on charge carrier concentration-dependent hole mobility in pentacene thin-film transistors: advantages of high deposition rate
Authors: Jena Sanjoy , Ray Debdutta
Published: September 2020

The combined effect of deposition rate and substrate temperature on the film crystallinity, morphology, and electronic properties of pentacene is studied. It is shown that the channel mobility in polycrystalline pentacene thin-film transistors is relatively immune to substrate temperature, and the films offer good hole mobility when grown at a high rate. This is advantageous when high throughput with low deviation in electrical parameters over devices are required. The surface morphology is characterized by atomic force microscopy measurements and the crystallinity is studied using x-ray diffraction. The effect of growth parameters on the crystalline phases of pentacene is correlated to the charge carrier transport. It is found that the field-effect mobility is primarily affected by the crystalline phases of the film rather than the grain size. The charge carrier dependence of the hole mobility is used to parameterize the dispersion (width) in the density of states (DOS) of the highest occupied molecular orbital of the films in the transistor channel region. It is found that the presence of multiple phases in the path of the charge carrier flow increases the dispersion of the DOS.
Ruthenium-based fast-responding pressure-sensitive paint for measuring small pressure fluctuation in low-speed flow field
Authors: Egami Y , Hasegawa A , Matsuda Y , Ikami T , Nagai H
Published: September 2020

A sprayable fast-responding pressure-sensitive paint (fast-PSP) has been developed to measure time-resolved small pressure fluctuation on model surfaces. To realize PSP with fast response, high robustness, and high luminescence intensity, we have developed a novel ruthenium complex-based fast-PSP. The binder layers of the proposed fast-PSP were prepared by mixing room-temperature-vulcanizing silicone (silicone) and titanium dioxide (TiO2) particles with different sizes and their effects on the properties including the time response, pressure sensitivity, and luminescence intensity were investigated. The effects of the hydrophilic and hydrophobic surface treatments of TiO2 particle on the structure and mechanical robustness of the binder layer were also studied. The developed fast-PSP was applied to the flow field measurements behind a square cylinder and was evaluated. We have succeeded in obtaining time-series data of pressure fluctuation with high accuracy even at a mean velocity of 20 m s−1.
An improved deep residual network with multiscale feature fusion for rotating machinery fault diagnosis
Authors: Deng Feiyue , Ding Hao , Yang Shaopu , Hao Rujiang
Published: September 2020

Intelligent mechanical fault diagnosis algorithms based on deep learning have achieved considerable success in recent years. However, degradation of the diagnostic accuracy and operational speed has been significant due to unfavorable working conditions and increasing network depth. An improved version of ResNets is proposed in this paper to address these issues. The advantages of the proposed network are presented as follows. Firstly, a multi-scale feature fusion block was designed, to extract multi-scale fault feature information. Secondly, an improved residual block based on depthwise separable convolution was used to improve the operational speed and alleviate the computational burden of the network. The effectiveness of the proposed network was validated by discriminating between diverse health states in a gearbox under normal and noisy conditions. The experimental results show that the proposed network model has a higher classification accuracy than the classical convolutional neural networks, LeNet-5, AlexNet and ResNets and a faster calculation speed than the classical deep neural networks. Furthermore, a visual study of the different stages of the network model was conducted, to effectively comprehend the operational processes of the proposed model.
Self-supporting covalent organic framework membranes synthesized through two different processes: solvothermal annealing and solvent vapor annealing
Authors: Turangan Nikka , Xu Yanan , Spratt Henry , Rintoul Llewellyn , Bottle Steven , MacLeod Jennifer
Published: September 2020

Rigid, freestanding covalent organic framework (COF-1) membranes have been synthesized from 1,4-benzenediboronic acid (BDBA) precursors using two different approaches: room temperature solvent-vapour annealing (SVA) and solvothermal annealing (SA). Characterization of films using Fourier-transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD), and various microscopies shows that the films obtained through the two different routes vary in their retained BDBA proportion, crystal size and macroscale morphology. Gas adsorption measurements give specific surface areas of 579 ± 7 m2 g−1 and 739 ± 11 m2 g−1 respectively, suggesting that the average porosity of these films is competitive with bulk-synthesized COF-1 particles. The films have a stratified structure, with a dense, thin top layer and a thicker, sponge-like base layer. Using nanoindentation, we measured the Young’s modulus at the top surface of the SVA and SA films to be 3.64 ± 1.20 GPa and 3.33 ± 0.12 GPa respectively, with the smaller uncertainty for the SA film attributed to a more uniform morphology. These measurements provide useful experimental data pertaining to COF-1 mechanical properties, furnishing information relevant to the use of these free-standing membranes in applications such as gas filtration or storage.
Shape-controlled synthesis of Ag/Cs4PbBr6 Janus nanoparticles
Authors: Su Sijing , Shen Jialin , Sun Haochen , Tao Jiaqi , Xu Da , Wei Tong , Fan Chao , Wang Ziying , Sun Chun , Bi Wengang
Published: September 2020

The poor light absorption of visible light for Cs4PbBr6 nanocrystals (NCs) has severely impeded their practical applications. Although the semiconductor/perovskite heterostructure holds great promise for enhancement in absorption, it has remained a serious challenge for synthesizing a semiconductor/perovskite heterostructure. In this work, monodispersed Janus heterostructures composed of Cs4PbBr6 decorated with either multiple Ag or single Ag on its surface (named as mAg/Cs4PbBr6 and sAg/Cs4PbBr6 respectively), are successfully prepared. The size of Ag seeds has an important effect on the shape of the products. Small-sized Ag seeds lead to the formation of mAg/Cs4PbBr6 Janus NCs, while relatively large-sized Ag seeds produce sAg/Cs4PbBr6 Janus NCs. It is noted that this work not only provides a novel method for the modification of individual Cs4PbBr6 NCs, but also enhances the absorption of the Cs4PbBr6 in the visible region, indicating great potential for optoelectronic applications, such as photocatalysis and solar cells.
Highly transparent, low sheet resistance and stable Tannic acid modified-SWCNT/AgNW double-layer conductive network for organic light emitting diodes
Authors: Zhu Ze-Ru , Geng Wenming , Zhu Qingxia , Ethiraj Anita Sagadevan , Wang Tao , Jing Li-Chao , Ning Yu-Jie , Tian Yi , Geng Wen-Hao , Wu Lei , Geng Hong-Zhang
Published: September 2020

In this paper, we used tannic acid (TA) functionalized carbon nanotubes (TCNTs), and silver nanowires (AgNWs) to construct a new type of transparent conductive film (TCF) with a double-layered conductive network structure. The hybrid film exhibits excellent light transmittance, high electrical conductivity, ultra-flexibility, and strong adhesion. These outstanding performances benefit from the filling and adhesion of hydrophilic TCNT layers to the AgNW networks. Besides, we introduced the post-treatment process of mechanical pressing and covering polymer conductive polymer PEDOT:PSS, which obtained three layers of TCNT/AgNW/PEDOT hybrid film and greatly improved the comprehensive properties. The hybrid film can reach a sheet resistance of 9.2 Ω sq−1 with a transmittance of 83.4% at 550 nm wavelength, and a low root mean square (RMS) roughness (approximately 3.8 nm). After 10 000 bends and tape testing, the conductivity and transmittance of the hybrid film remain stable. The resistance of the film has no significant degradation after 14 d of exposure to high temperature of 85 °C and humidity of 85%, indicating excellent stability. The organic light-emitting diodes (OLEDs) with TCNT/AgNW/PEDOT hybrid film as anode exhibit high current density and luminosity, confirming this process has considerable potential application in photovoltaic devices.
Dynamic experimental behavior of sandwich beams with honeycomb core filled with magnetic rheological gel: a statistical approach
Authors: Faria Lucas Eduardo Ribeiro , Gomes Guilherme Ferreira , Gomes de Sousa Sara Raquel , Bombard Antonio José Faria , Ancelotti Jr Antonio Carlos
Published: September 2020

With the rapid advancement of technology comes the need for lighter weight and higher strength materials, so studies on new materials and manufacturing techniques are needed. The aeronautics industry is always at the forefront of researching new materials, where the weight factor is crucial. In contrast, aircraft suffer from intense mechanical vibration and the ability to control these vibrations is of paramount importance for stability of the aircraft and its structural integrity. To control these intense vibrations, intelligent materials have been pointed as a possible resource for vibration control, since it is possible to vary the modal frequencies of the structure through electrical or magnetic excitations. The objective of this study is to analyze the dynamic behavior under the influence of vibrations in sandwich beams, which have honeycomb cores filled with magnetorheological (MR) gels and composite material skins. The development of the work has an experimental analysis through free and forced vibration tests to determine the modal parameters of the beams built according to the applied magnetic field intensity, and a statistical analysis to determine the design factors that most impacted this process. With the results obtained, the use of these materials is promising in structures, due to the fact that they achieve reductions in the value of natural frequencies in the order of 54%, increase in damping factors of up to 390% and decrease in forced vibration amplitude of 40% in relation to the use of a magnetic field. Results obtained from design of experiments showed that the factor that most influenced the response of free and forced vibration assays was the gel. For this, it is proposed new models of smart beams, since there are few studies in the honeycomb core filled with MR gel.
Transverse-pressure susceptibility of high-Jc
RRP and PIT types of Nb3Sn Rutherford cables for accelerator magnets
Authors: Gao P , Dhallé M , Bordini B , Ballarino A , Ten Kate H H J
Published: September 2020

In the frame of the High-Luminosity Large Hadron Collider construction and Future Circular Collider development program, the magnetic field in the accelerator dipole magnets is being enhanced to 11 T, and 15 T to 16 T level, respectively. Advanced Nb3Sn superconductors with a non-copper critical current density exceeding 2500 A mm−2 at 4.2 K and 12 T, are being developed using the Restacked-Rod-Process (RRP) and Powder-In-Tube (PIT) wire technologies. However, since Nb3Sn is extremely brittle, it is a significant challenge to construct the high-field dipole magnets with such very strain-susceptible superconductor. The high-level of stress acting on the wide face of the Rutherford cables in the coils of 120 MPa to 200 MPa generated by the Lorenz’ force, causes initially a reversible reduction and eventually at some stress level followed by permanent degradation of the critical current when strain goes to high. This study sets out to examine the critical current and upper critical field performance of state-of-the-art RRP and PIT Nb3Sn Rutherford cables in terms of transverse pressure. The variation of the critical current and upper critical field due to the thermal- and mechanical load-cycling was investigated as well. For reference, the critical current of witness wires characterized on standard ITER type barrels were also measured. The results indicate that the RRP type of Nb3Sn Rutherford cables, when fully impregnated with epoxy resin, are able to withstand a transverse stress of 170 MPa to 250 MPa without noticeable irreversible critical current reduction. For the transverse pressure limit for present PIT type of Nb3Sn Rutherford cables somewhat lower values are found at the level of 50 MPa to 120 MPa. Therefore, given the present cables, the high-field dipole magnet construction can be realized using the RRP Nb3Sn Rutherford cables, while for PIT type cables more cable development is requested to enhance the onset of irreversible degradation. The reversible critical current reduction in RRP type of cables of 10% at 150 MPa to 250 MPa needs to be taken into account when predicting magnet performance. Finally, extreme care needs to be taken into account for Nb3Sn coil fabrication, since the experimental results show significant critical current reduction due to stress concentrations already at 0.2° misalignment angles between the pressure applying surface and the surface of the impregnated cable.
Analysis of mechanical behavior in inhomogeneous high-temperature superconductors under pulsed field magnetization
Authors: Wu Haowei , Yong Huadong , Zhou Youhe
Published: September 2020

Melt-textured large, single-grain REBCO (RE: rare earth element or Y) bulk superconductors have growth sector boundaries (GSBs) and growth sector regions (GSRs). The critical current density is dependent on the GSBs and the GSRs, which will influence the electromagnetic field and the temperature field distributions. REBCO bulk superconductors are brittle materials and during the manufacturing process, cracks and inclusions may exist, therefore it is necessary to analyze the mechanical response during the magnetization process. In this paper, the mechanical response of an inhomogeneous cylinder superconductor under electromagnetic stress and the thermal stress during the pulsed field magnetization process is studied. By solving the coupled magnetic and heat diffusion equations in association with a modified

E
−
J

power-law relationship, we can obtain the electromagnetic field and the temperature field distributions; then, the mechanical response of the bulk can be determined. The trend shown by our numerical simulation is consistent with the experimental results. Then we study the mechanical behavior of inhomogeneous high-temperature superconductors with and without a flux jump. The case without or with the SUS 304 ring is also analyzed.
Neural-network accelerated coupled core-pedestal simulations with self-consistent transport of impurities and compatible with ITER IMAS
Authors: Meneghini O. , Snoep G. , Lyons B.C. , McClenaghan J. , Imai C.S. , Grierson B. , Smith S.P. , Staebler G.M. , Snyder P.B. , Candy J. , Belli E. , Lao L. , Park J.M. , Citrin J. , Cordemiglia T.L. , Tema A. , Mordijck S.
Published: September 2020

An integrated modeling workflow capable of finding the steady-state plasma solution with self-consistent core transport, pedestal structure, current profile, and plasma equilibrium physics has been developed and tested against a DIII-D discharge. Key features of the achieved core-pedestal coupled workflow are its ability to account for the transport of impurities in the plasma self-consistently, as well as its use of machine learning accelerated models for the pedestal structure and for the turbulent transport physics. Notably, the coupled workflow is implemented within the One Modeling Framework for Integrated Tasks (OMFIT) framework, and makes use of the ITER integrated modeling and analysis suite data structure for exchanging data among the physics codes that are involved in the simulations. Such technical advance has been facilitated by the development of a new numerical library named ordered multidimensional arrays structure.
Retraction: Intelligent Model for Electric Power Management: Patterns (Journal of Physics: Conference Series
1432 012032)
Authors: Viloria Amelec , Palma Hugo Hernández , Suarez Ramiro Gamboa , Núñez William Niebles , Movilla José Solórzano
Published: September 2020

Published 15 September 2020

This article, and others within this volume, has been retracted by IOP Publishing following clear evidence of plagiarism and citation manipulation.

This work was originally published in Spanish (1) and has been translated and published without permission or acknowledgement to the original authors. IOP Publishing Limited has discovered other papers within this volume that have been subjected to the same treatment. This is scientific misconduct.

Misconduct investigations are ongoing at the author’s institutions. IOP Publishing Limited will update this notice if required once those investigations have concluded. To date, there is no evidence to suggest anyone other than Amelec Viloria / Jesus Silva was directly culpable for the actions that led to retraction.

Misconduct investigations are ongoing at the author’s institutions. IOP Publishing Limited will update this notice if required once those investigations have concluded.

Anyone with any information regarding these papers is requested to contact conferenceseries@ioppublishing.org.
Retraction: Big Data and Automatic Detection of Topics: Social Network Texts (Journal of Physics: Conference Series
1432 012073)
Authors: Silva Jesús , Palma Hugo Hernández , Núñez William Niebles , Ruiz-Lazaro Alex , Varela Noel
Published: September 2020

Published 15 September 2020

This article, and others within this volume, has been retracted by IOP Publishing following clear evidence of plagiarism and citation manipulation.

This work was originally published in Spanish (1) and has been translated and published without permission or acknowledgement to the original authors. IOP Publishing Limited has discovered other papers within this volume that have been subjected to the same treatment. This is scientific misconduct.

Misconduct investigations are ongoing at the author’s institutions. IOP Publishing Limited will update this notice if required once those investigations have concluded. To date, there is no evidence to suggest anyone other than Amelec Viloria / Jesus Silva was directly culpable for the actions that led to retraction.

IOP Publishing Limited request any citations to this article be redirected to the original work (1).

Anyone with any information regarding these papers is requested to contact conferenceseries@ioppublishing.org.
Retraction: Electrical Consumption Patterns through Machine Learning (Journal of Physics: Conference Series
1432 012093)
Authors: Viloria Amelec , Naveda Alexa Senior , Palma Hugo Hernández , Núñez William Niebles , Núñez Leonardo Niebles
Published: September 2020

Published 15 September 2020

This article, and others within this volume, has been retracted by IOP Publishing following clear evidence of plagiarism and citation manipulation.

This work was originally published in Spanish (1) and has been translated and published without permission or acknowledgement to the original authors. IOP Publishing Limited has discovered other papers within this volume that have been subjected to the same treatment. This is scientific misconduct.

Misconduct investigations are ongoing at the author’s institutions. IOP Publishing Limited will update this notice if required once those investigations have concluded. To date, there is no evidence to suggest anyone other than Amelec Viloria / Jesus Silva was directly culpable for the actions that led to retraction.

IOP Publishing Limited request any citations to this article be redirected to the original work (1).

Anyone with any information regarding these papers is requested to contact conferenceseries@ioppublishing.org.
Retraction: Method for Collecting Relevant Topics from Twitter supported by Big Data (Journal of Physics: Conference Series
1432 012094)
Authors: Silva Jesús , Naveda Alexa Senior , Suarez Ramiro Gamboa , Palma Hugo Hernández , Núñez William Niebles
Published: September 2020

Published 15 September 2020

This article, and others within this volume, has been retracted by IOP Publishing following clear evidence of plagiarism and citation manipulation.

This work was originally published in Spanish (1) and has been translated and published without permission or acknowledgement to the original authors. IOP Publishing Limited has discovered other papers within this volume that have been subjected to the same treatment. This is scientific misconduct.

Misconduct investigations are ongoing at the author’s institutions. IOP Publishing Limited will update this notice if required once those investigations have concluded. To date, there is no evidence to suggest anyone other than Amelec Viloria / Jesus Silva was directly culpable for the actions that led to retraction.

IOP Publishing Limited request any citations to this article be redirected to the original work (1).

Anyone with any information regarding these papers is requested to contact conferenceseries@ioppublishing.org.
Coriolis Coupling in the Continuum
Authors: Macchiavelli A. O. , Casten R. F. , Clark R. M. , Crawford H. L. , Fallon P.
Published: September 2020

In 1956 A. Kerman explained the observed energy levels of the lowest K = 1/2 and K = 3/2 bands in 183W as resulting from rotational perturbations due to the effects of the Coriolis force. Following from that seminal paper, in this work we consider Kerman’s problem when one of the Nilsson single-particle levels involved is a resonant state. This is the simplest model of Coriolis mixing that allows for analytical expressions derived in first-order perturbation theory, without losing the main physical ingredients of the continuum effects. We present results for the perturbed solution of the ground state band energies as a function of the state width, which suggest a general behavior of both increased moment of inertia and staggering.
Neutron-Proton Pairing and its Impact on Gamow-Teller Transitions
Authors: Pittel S. , Carranza M. A. , Hirsch J. G.
Published: September 2020

We report a systematic study of Gamow-Teller (GT) transitions in the 2p1f shell, using the nuclear shell model with a schematic Hamiltonian. The Hamiltonian used contains a quadrupole-quadrupole interaction, isoscalar (T = 0) and isovector (T = 1) pairing interactions as well as a single-particle energy term. The objective of the work is to observe the behavior of GT transitions in different isoscalar and isovector pairing scenarios. We also study their corresponding effect on the energy spectra of the parent and daughter nuclei involved in the GT decays. All results are discussed in relation to experimental data. A key conclusion reached is that with the schematic Hamiltonian we use it is essential to suppress the isoscalar pairing mode when treating nuclei with a neutron excess to avoid producing spurious results for the ground state spin and parity. Varying the strength parameters for the two pairing modes is found to exhibit different but systematic effects on GT transition properties and on the corresponding energy spectra.
Retraction: Analysis of air quality data in the city of Bogotá through clustering techniques (IOP
Conf. Series: Materials Science and Engineering
872 012027)
Authors: Silva Jesús , Londoño Luz Adriana , Varela Noel , Pineda Lezama Omar Bonerge , Lozano Ayarza Liliana Patricia , Mojica Herazo Julio Cesar
Published: September 2020

Published 15 September 2020

This article, and others within this volume, has been retracted by IOP Publishing following clear evidence of plagiarism and citation manipulation.

This work was originally published in Spanish (1) and has been translated and published without permission or acknowledgement to the original authors. IOP Publishing Limited has discovered other papers within this volume that have been subjected to the same treatment. This is scientific misconduct.

Misconduct investigations are ongoing at the author’s institutions. IOP Publishing Limited will update this notice if required once those investigations have concluded.

IOP Publishing Limited request any citations to this article be redirected to the original work (1).

Anyone with any information regarding these papers is requested to contact conferenceseries@ioppublishing.org.
Designing the Fault-Detection and Troubleshooting Tests For the Troubleshooting Target Flowchart
Authors: Khusnutdinova E M , Filina O A , Khusnutdinov A N , Yashagina A V , Osetinskiy G V , Andreev N K
Published: September 2020

This paper covers the matter of troubleshooting in urban electric transport and electrical equipment. The solution to this issue requires transferring the qualitative determination of the health of the equipment to some quantitative basis. The formalization of qualitative definitions is a prerequisite for constructing formal (computable) troubleshooting algorithms.
To the question of automation of the injection molding process
Authors: Pankratov D L , Gavariev R V
Published: September 2020

The article discusses the features of the injection molding process (IMP) from the point of view of the possibility of process automation. The main factors of the casting process that provide a good opportunity for process automation are indicated. The range of tasks of the injection molding process is determined, for the solution of which it is advisable to use an expert system (ES). The ES model for injection molding is proposed, which provides high-quality castings.
Recycling components made of polyurethane foam
Authors: Shafigullin L N , Romanova N V , Gabrakhmanov A T , Korchagin O P , Shamsutdinov I R , Agashkin D A
Published: September 2020

The paper studies the influence of recyclable materials and waste (that are sandwich structures of polyurethane foam products) on physical mechanical properties of polyurethane foam products. It was established that indentation load deflection changed by 11 percent, thermal conductivity coefficient - by 12.5 percent, and the strength of bond between face layer and flexible PU foam remains the same (0.3 N/mm) when compared with PU foam products.
To quantum or not to quantum: towards algorithm selection in near-term quantum optimization
Authors: Moussa Charles , Calandra Henri , Dunjko Vedran
Published: September 2020

The Quantum approximate optimization algorithm (QAOA) constitutes one of the often mentioned candidates expected to yield a quantum boost in the era of near-term quantum computing. In practice, quantum optimization will have to compete with cheaper classical heuristic methods, which have the advantage of decades of empirical domain-specific enhancements. Consequently, to achieve optimal performance we will face the issue of algorithm selection, well-studied in practical computing. Here we introduce this problem to the quantum optimization domain. Specifically, we study the problem of detecting those problem instances of where QAOA is most likely to yield an advantage over a conventional algorithm. As our case study, we compare QAOA against the well-understood approximation algorithm of Goemans and Williamson on the Max-Cut problem. As exactly predicting the performance of algorithms can be intractable, we utilize machine learning (ML) to identify when to resort to the quantum algorithm. We achieve cross-validated accuracy well over 96%, which would yield a substantial practical advantage. In the process, we highlight a number of features of instances rendering them better suited for QAOA. While we work with simulated idealised algorithms, the flexibility of ML methods we employed provides confidence that our methods will be equally applicable to broader classes of classical heuristics, and to QAOA running on real-world noisy devices.
The unitary extension principle for locally compact abelian groups with co-compact subgroups
Authors: Christensen Ole , Goh Say Song
Published: September 2020

The unitary extension principle by Ron and Shen is one of the cornerstones of wavelet frame theory; it leads to tight frames forL2(R)L^{2}(\mathbb {R})and associated expansions of functionsf∈L2(R)f\in L^{2}(\mathbb {R})of similar type as those for orthonormal wavelet bases. In this paper, the unitary extension principle is extended to the setting of a locally compact abelian group, equipped with a collection of nested co-compact subgroups. Unlike all previously known generalizations of the unitary extension principle, the current one is taking place within the setting of continuous frames, which means that the resulting decompositions of functions in the underlying Hilbert space in general are given in terms of integral representations rather than discrete sums. The frame elements themselves appear by letting a collection of modulation operators act on a countable family of basic functions.
The impact of COVID-19 on adjusted mortality risk in care homes for older adults in Wales, UK: a retrospective population-based cohort study for mortality in 2016–2020
Authors: Hollinghurst Joe , Lyons Jane , Fry Richard , Akbari Ashley , Gravenor Mike , Watkins Alan , Verity Fiona , Lyons Ronan A
Published: September 2020

Background

mortality in care homes has had a prominent focus during the COVID-19 outbreak. Care homes are particularly vulnerable to the spread of infectious diseases, which may lead to increased mortality risk. Multiple and interconnected challenges face the care home sector in the prevention and management of outbreaks of COVID-19, including adequate supply of personal protective equipment, staff shortages and insufficient or lack of timely COVID-19 testing.

Aim

to analyse the mortality of older care home residents in Wales during COVID-19 lockdown and compare this across the population of Wales and the previous 4 years.

Study Design and Setting

we used anonymised electronic health records and administrative data from the secure anonymised information linkage databank to create a cross-sectional cohort study. We anonymously linked data for Welsh residents to mortality data up to the 14th June 2020.

Methods

we calculated survival curves and adjusted Cox proportional hazards models to estimate hazard ratios (HRs) for the risk of mortality. We adjusted HRs for age, gender, social economic status and prior health conditions.

Results

survival curves show an increased proportion of deaths between 23rd March and 14th June 2020 in care homes for older people, with an adjusted HR of 1.72 (1.55, 1.90) compared with 2016. Compared with the general population in 2016–2019, adjusted care home mortality HRs for older adults rose from 2.15 (2.11, 2.20) in 2016–2019 to 2.94 (2.81, 3.08) in 2020.

Conclusions

the survival curves and increased HRs show a significantly increased risk of death in the 2020 study periods.
Clinicopathologic Features of Peripheral T-Cell Lymphoma in Sub-Saharan Africa
Authors: Fitzpatrick Megan J , Sayed Shahin , Moloo Zahir , Kayembe Mukendi K A , Roberts Drucilla J , Pham Thu-Anh , Xi Liqiang , Raffeld Mark , Louissaint Abner , Sohani Aliyah R
Published: September 2020

Objectives

Peripheral T-cell lymphomas (PTCLs) are heterogeneous, clinically aggressive, and rare. Subtype distribution varies by geographic location; however, data from sub-Saharan Africa (SSA) are lacking. We sought to elucidate clinicopathologic features of PTCL in SSA.

Methods

We reviewed PTCL consultation cases from three SSA countries. PTCL subtype was determined per 2017 World Health Organization classification. Cases with sufficient material were evaluated by polymerase chain reaction for human T-cell leukemia virus type 1 (HTLV-1) and T-cell receptor γ (TCRG) rearrangement.

Results

Among 32 cases, median age was 45 years and male-to-female ratio was 1.7. Thirty (94%) of 32 cases required additional workup for subclassification. PTCL, not otherwise specified (PTCL-NOS) was the most common subtype (13/32, 41%), followed by PTCL with T-follicular helper phenotype (6/32, 19%) and systemic anaplastic large cell lymphoma (6/32, 19%). Four (16%) of 25 cases were Epstein-Barr virus positive (EBV+) (2/2 extranodal natural killer/T-cell lymphoma, 1/13 PTCL-NOS, and 1/4 angioimmunoblastic T-cell lymphoma with EBV+ immunoblasts). Two (15%) of 13 patients with PTCL-NOS were human immunodeficiency virus positive. No cases with evaluable DNA (0/15) were HTLV-1 positive, and 9 of 10 showed clonal TCRG rearrangements.

Conclusions

In comparison to Western studies, PTCLs from SSA show similar subtype distribution and male predominance but a younger age at diagnosis. Appropriate diagnosis of PTCL requires extensive ancillary testing not readily available in low-income countries, including much of SSA.
Overall Survival Among Chemotherapy-Naive Patients With Castration-Resistant Prostate Cancer Under Abiraterone Versus Enzalutamide: A Direct Comparison Based on a 2014–2018 French Population Study (the SPEAR Cohort)
Authors: Scailteux Lucie-Marie , Campillo-Gimenez Boris , Kerbrat Sandrine , Despas Fabien , Mathieu Romain , Vincendeau Sébastien , Balusson Frédéric , Happe André , Nowak Emmanuel , Oger Emmanuel
Published: September 2020

Abiraterone acetate (ABI) and enzalutamide (ENZ) are considered to be clinically relevant comparators among chemotherapy-naive patients with castration-resistant prostate cancer. No clinical trials comparing overall survival with ABI versus ENZ in a head-to-head approach have been published so far. A few observational studies with low power suggested a potential benefit of ENZ. We used the French National Health Data System to compare overall survival of new users of ABI and ENZ among chemotherapy-naive patients with castration-resistant prostate cancer in 2014–2017, followed through 2018 (the SPEAR cohort, a 2014–2018 cohort study). With an intent-to-treat approach, a survival analysis was performed, estimating hazard ratios for overall survival with the inverse probability weighted Cox model method. Among 10,308 new users, 64% were treated with ABI and 36% with ENZ. The crude mortality rate was 25.2 per 100 person-years (95% confidence interval (CI): 24.4, 26.0) for ABI and 23.7 per 100 person-years (95% CI: 22.6, 24.9) for ENZ. In the weighted analysis, ENZ was associated with better overall survival compared with ABI (hazard ratio = 0.90 (95% CI: 0.85, 0.96) with a median overall survival of 31.7 months for ABI and 34.2 months for ENZ). When restricting to 2015–2017 new users, the effect estimate shifted up to a hazard ratio of 0.93 (95% CI: 0.86, 1.01).
Differences in Adolescent Symptom Reporting Following Motor Vehicle Accident Versus Sport-Related Concussion
Authors: Tarkenton Tahnae , Caze II Todd , Silver Cheryl H , Hynan Linda S , Didehbani Nyaz , Miller Shane , Batjer Hunt , Bell Kathleen , Cullum C Munro
Published: September 2020

Objective

To characterize potential differences in youth concussion sustained in motor vehicle accident (MVA) versus sport-related concussion (SRC), hypothesizing that youth who sustain concussion in a MVA would endorse higher initial and persistent symptom scores compared to those with SRC, despite similar injury severity levels.

Methods

Participants age 12–18 who sustained a concussion (i.e., Glasgow Coma Scale = 13–15) in a MVA (n = 35) were matched with SRC participants (n = 35) by sex, age, and days since injury. ANCOVA comparing initial postconcussion total symptom scores between the MVA and SRC groups were performed. Chi-square analysis with injury group by recovery time was used to determine whether youth who sustained concussion from MVA were more likely to endorse symptoms persisting >30 days at 3 months postinjury, and ANCOVA compared 3-month total symptom scores.

Results

On average, the MVA group reported significantly higher initial postconcussion and more frequent persistent symptom scores compared to the SRC group.

Conclusions

This is the first known study to examine context of injury in youth concussion while matching for injury severity, age, sex, and days since injury. Findings suggest the context of injury is an important clinical variable related to initial reporting of symptoms and endorsement of symptoms lasting more than 30 days. Tailored interventions that consider the context of injury may facilitate symptom resolution.