bluuebunny/crossref_metadata_2025_split huggingface dataset:
High-precision broadband linear polarimetry of early-type binaries
Authors: Abdul Qadir Yasir , Berdyugin Andrei V. , Piirola Vilppu , Sakanoi Takeshi , Kagitani Masato 
Published: January 2023

Aims. The fact that the O-type close binary star system AO Cassiopeiae exhibits variable phase-locked linear polarization has been known since the mid-1970s. In this work, we re-observe the polarization arising from this system more than 50 yr later to better estimate the interstellar polarization and to independently derive the orbital parameters, such as inclination, i, orientation, Ω, and the direction of the rotation for the inner orbit from the phase-folded polarization curves of the Stokes q and u parameters.
Methods. The Dipol-2 polarimeter was used to obtain linear polarization measurements of AO Cassiopeiae in the B, V, and R passbands with the T60 remotely controlled telescope at an unprecedented accuracy level of ~0.003%. We have obtained the first proper quantification of the interstellar polarization in the direction heading towards AO Cas by observing the polarization of three neighboring field stars. We employed a Lomb-Scargle algorithm and detected a clear periodic signal for the orbital period of AO Cas. The standard analytical method based on a two-harmonics Fourier fit was used to obtain the inclination and orientation of the binary orbit.
Results. Our polarimetric data exhibited an unambiguous periodic signal at 1.76 days, thus confirming the orbital period of the binary system of 3.52 days. Most of the observed polarization is of interstellar origin. The de-biased values of the orbital inclination are i = 63° + 2°/−3° and orientation of Ω = 29º(209º) ± 8°. The direction of the binary system rotation on the plane of the sky is clockwise.
Spectroscopic investigation of interstellar hydrogenated carbon clusters
Authors: Dubosq Clément , Pla Paula , Dartois Emmanuel , Simon Aude 
Published: January 2023

Context. The assignment of the mid-infrared (mid-IR) emission features and plateaus observed in C-rich and H-rich regions of the interstellar medium (ISM) is still debated. Such mid-IR assignments must also be related to their contribution to the extinction curve in our galaxy and to the ultraviolet (UV) bump.
Aims. The aim of this work is to investigate the influence of hydrogenation rate on the mid-IR spectra of populations of carbon clusters in order to constraint the nH/nC ratios in regions of the ISM where carbon is an important component. Their potential contribution to the extinction curve and in particular to the UV bump is also investigated.
Methods. The absorption IR and optical spectra of tens of thousands of C24Hn (n = 0, 6, 12, 18, 24) isomers classified into structural families – namely flakes, branched, pretzels, and cages – were computed using the density functional based tight binding electronic structure method and its time-dependent version, respectively. Final spectra were obtained by averaging the spectra of many individual isomers.
Results. The shapes and the relative intensities of the bands centered at ~3.25 and 3.40 µm and assigned to the C–H stretch of sp2 and sp3 carbon atoms, respectively, present a clear dependence on the nH/nC ratio. From a comparison with the astronomical spectrum from the Orion bar H2S1, the most interesting emitting candidates would pertain to the flakes population; this is the most energetically favorable family of clusters, possessing a high content of five and six carbon rings and being mostly planar, with no sp1 carbon atoms and with a nH/nC ratio of lower than 0.5. The same conclusion is drawn when comparing the computed IR features in the [4–20 µm] region with the observed plateaus from some C-rich and H-rich planetary nebulae objects of the Small Magellanic Cloud. The contribution of the same family could be considered for the UV bump. When nH/nC increases, only a contribution to the high-energy part of the continuum due to σ → π✶ excitations can reasonably be considered.
Conclusions. These results bring some constraints on the structural features and on the nH/nC ratio of the hydrogenated carbon populations emitting in the mid-IR domain in interstellar objects such as protoplanetary and reflection nebulae. The flakes population, with a low nH/nC ratio, is an interesting candidate for the carbon population emitting in these regions, but not for that absorbing in the diffuse ISM. None of the populations studied in the present work can account for the UV bump, but they would contribute to a broad extinction rise in this domain. The computed features reported in this article could be used to interpret future astronomical data provided by the James Webb Space Telescope.
Sustainable Chemical Synthesis of 2,3-Dihydrobenzofurans/1,2,3-Trisubstituted Indanes in Water by Using a Permethylated β-Cyclodextrin-Tagged N-Heterocyclic Carbene–Gold Catalyst
Authors: Morita Nobuyoshi , Krause Norbert , Chiaki Hitomi , Tanaka Kosaku , Hashimoto Yoshimitsu , Tamura Osamu 
Published: January 2023

AbstractAn environmentally friendly stereoselective synthesis of 2,3-dihydrobenzofurans and 1,2,3-trisubstituted indanes in water has been achieved by using a permethylated β-cyclodextrin-tagged N-heterocyclic carbene–gold complex. The gold catalyst can be recycled at least five times.
Enantioselective Synthesis of Dispirooxindole Derivatives via Asymmetric Catalytic Cascade Reactions
Authors: Hu Xiu-Qin , Xu Peng-Fei , Ma Rui , Zhang Jia-Lu 
Published: January 2023

AbstractA series of optically active 3,3′-pyrrolidinyl-dispirooxindole derivatives containing a CF3 moiety have been efficiently constructed through asymmetric catalytic cascade reactions catalyzed by cinchona-derived bifunctional squaramide catalyst, bearing four contiguous stereogenic centers, two of which are vicinal spiro-stereocenters. Additionally, a wide range of substituted products were achieved with moderate to high yields (up to 99% yield) and excellent stereoselectivities (up to >20:1 dr for all cases and up to 99% ee).
Chronic non-cancer pain management – insights from Australian general practitioners: a qualitative descriptive study
Authors: Gilkes Lucy , Bulsara Caroline , Mavaddat Nahal 
Published: January 2023

Background The study explored the experiences and perceptions of GPs regarding the management of chronic non-cancer pain (CNCP). Specifically, participants were asked to identify perceived enablers and barriers to CNCP care and how the care of patients with CNCP may be improved. Methods The study utilised a qualitative descriptive methodology. General practice in Western Australia. The sample was purposive with 12 Australian GPs from predominantly metropolitan locations and with experience in managing CNCP. Semi structured interviews were conducted. Each interview was of 45–60 min duration. All interviews were audio recorded and transcribed using a secure transcription service. Thematic analysis developed themes inductively and deductively. Results Themes emerged regarding: the importance of a holistic and personalised approach; the important role of a coordinating GP; the need for an evidence-based approach to opioid management; concerns relating to access to multidisciplinary services; the importance of clinician and patient education regarding CNCP; and an acknowledgement of the challenges for doctors and patients in managing CNCP. Conclusions Currently, the management of CNCP in Australia is challenging. Notable challenges include: difficulties with continuity of patient care; challenges with patient expectations of treatment, in particular opioid medications; difficulty with access to the health services required to enable holistic care; and the need for improved pain education in the community. The breadth of these challenges suggests there is a need for supportive organisational and structural considerations in the healthcare system to enable optimal care of CNCP in the community.
The microbiome stabilizes circadian rhythms in the gut
Authors: Zhang Yueliang , Li Yongjun , Barber Annika F. , Noya Sara B. , Williams Julie A. , Li Fu , Daniel Scott G. , Bittinger Kyle , Fang Jichao , Sehgal Amita 
Published: January 2023

The gut microbiome is well known to impact host physiology and health. Given widespread control of physiology by circadian clocks, we asked how the microbiome interacts with circadian rhythms in the
Drosophila
gut. The microbiome did not cycle in flies fed ad libitum, and timed feeding (TF) drove limited cycling only in clockless

per
01

flies. However, TF and loss of the microbiome influenced the composition of the gut cycling transcriptome, independently and together. Moreover, both interventions increased the amplitude of rhythmic gene expression, with effects of TF at least partly due to changes in histone acetylation. Contrary to expectations, timed feeding rendered animals more sensitive to stress. Analysis of microbiome function in circadian physiology revealed that germ-free flies reset more rapidly with shifts in the light:dark cycle. We propose that the microbiome stabilizes cycling in the host gut to prevent rapid fluctuations with changing environmental conditions.
Gate-controlled hysteresis curves and dual-channel conductivity in an undoped Si/SiGe 2DEG structure
Authors: Zhang Di , Yuan Guodong , Liu Yumeng , Li Ze , Song Luhang , Lu Jun , Zhang Jieyin , Zhang Jianjun , Luo Junwei 
Published: January 2023

Abstract
Exploring the cryogenic transport properties of two-dimensional electron gas in semiconductor heterostructures is always a focus of fundamental research on Si-based gate-controlled quantum devices. In this work, based on the electrical and magnetic transport characteristics of Si/SiGe heterostructure Hall bar-shaped field effect transistors (FETs) at 10 K and 1.6 K, we study the effects of electron tunneling, which occurs in the heterostructure and populates the oxide/semiconductor interface, on its transport properties. The initial position of dual-channel conduction is determined by the gate-controlled electrical hysteresis curves. Furthermore, we discover that there exist different tunneling mechanisms of electrons in a Si quantum well under the action of gate voltage, and the electron tunneling can well explain the two drain current plateaus appearing in direct-current transfer characteristics. Combining the power-law exponent of electron mobility versus density curve and the gate-related Dingle ratio, we clarify the dominant scattering mechanism, and the result can be supported by different tunneling mechanisms. Our work demonstrates the gate-dependent electronic transport performance in undoped Si/SiGe heterostructure FETs, which has an implication for the development of Si/SiGe heterostructure gate-defined quantum dot quantum computation.
Prediction of π-electrons mediated high-temperature superconductivity in monolayer LiC12
Authors: Liu Ran , Lu Jiajun , Chen Hongxin , Zhao Xiuwen , Hu Guichao , Yuan Xiaobo , Ren Junfeng 
Published: January 2023

Abstract
Prediction and synthesis of two-dimensional high transition temperature (T
C) superconductors is an area of extensive research. Based on calculations of the electronic structures and lattice dynamics, we predict that graphene-like layered monolayer LiC12 is a π-electrons mediated Bardeen–Cooper–Schrieffer-type superconductor. Monolayer LiC12 is theoretically stable and expected to be synthesized experimentally. From the band structures and the phonon dispersion spectrum, it is found that the saddle point of π-bonding bands induces large density of states at the Fermi energy level. There is strongly coupled between the vibration mode in the in-plane direction of the lithium atoms and the π-electrons of carbon atoms, which induces the high-T
C superconductivity in LiC12. The T
C can reach to 41 K under an applied 10% biaxial tensile strain based on the anisotropic Eliashberg equation. Our results show that monolayer LiC12 is a good candidate as π-electrons mediated electron-phonon coupling high-T
C superconductor.
Uniaxial compressions induced complementarity and anisotropic behaviors in CuVP2S6
Authors: Wu Yulong , Li Yonghui , Liu Changlong 
Published: January 2023

Abstract
Uniaxial compressions in layered materials can change their electronic structures and properties. In this work, a bimetallic compound CuVP2S6 is simulated by using Density Functional Theory (DFT) in the presence of uniaxial compressions. Our results clearly show vertical compressions could lead to anisotropic behaviors, which include the compression effect caused by interlayer compression and the anisotropy of intralayer stretching. The vertical compressions change the V–S bonds and the P–S bonds respectively in AA and AB structures. The complementarity between intralayer stretching and interlayer compression could also result in adjustable bandgaps and degeneracy breakdown of V atoms. Results from the electron localization function analysis demonstrate that the free electrons of AA and AB structures tend to delocalize, and ionic features in V–S bonds could be weakened with increasing vertical compressions. Moreover, the two internal binding energies of AA and AB structures and the charge density difference analysis show that the anisotropy in the intralayer stretch and the charge transfer between metal atoms and S atoms increases gradually.
High in vitro activity of gold and silver nanoparticles from Solanum mammosum L. against SARS-CoV-2 surrogate Phi6 and viral model PhiX174
Authors: Pilaquinga Fernanda , Bosch Rafael , Morey Jeroni , Bastidas-Caldes Carlos , Torres Marbel , Toscano Fernanda , Debut Alexis , Pazmiño-Viteri Katherine , Nieves Piña María de las 
Published: January 2023

Abstract
The search for new strategies to curb the spread of the SARS-CoV-2 coronavirus, which causes COVID-19, has become a global priority. Various nanomaterials have been proposed as ideal candidates to inactivate the virus; however, because of the high level of biosecurity required for their use, alternative models should be determined. This study aimed to compare the effects of two types of nanomaterials gold (AuNPs) and silver nanoparticles (AgNPs), recognized for their antiviral activity and affinity with the coronavirus spike protein using PhiX174 and enveloped Phi6 bacteriophages as models. To reduce the toxicity of nanoparticles, a species known for its intermediate antiviral activity, Solanum mammosum L. (Sm), was used. NPs prepared with sodium borohydride (NaBH4) functioned as the control. Antiviral activity against PhiX174 and Phi6 was analyzed using its seed, fruit, leaves, and essential oil; the leaves were the most effective on Phi6. Using the aqueous extract of the leaves, AuNPs-Sm of 5.34 ± 2.25 nm and AgNPs-Sm of 15.92 ± 8.03 nm, measured by transmission electron microscopy, were obtained. When comparing NPs with precursors, both gold(III) acetate and silver nitrate were more toxic than their respective NPs (99.99% at 1 mg ml−1). The AuNPs-Sm were less toxic, reaching 99.30% viral inactivation at 1 mg ml−1, unlike the AgNPs-Sm, which reached 99.94% at 0.01 mg ml−1. In addition, cell toxicity was tested in human adenocarcinoma alveolar basal epithelial cells (A549) and human foreskin fibroblasts. Gallic acid was the main component identified in the leaf extract using high performance liquid chromatography with diode array detection (HPLC-DAD). The FT-IR spectra showed the presence of a large proportion of polyphenolic compounds, and the antioxidant analysis confirmed the antiradical activity. The control NPs showed less antiviral activity than the AuNPs-Sm and AgNPs-Sm, which was statistically significant; this demonstrates that both the S. mammosum extract and its corresponding NPs have a greater antiviral effect on the surrogate Phi bacteriophage, which is an appropriate model for studying SARS-CoV-2.
On the efficient global dynamics of Newton’s method for complex polynomials
Authors: Schleicher Dierk 
Published: January 2023

AbstractWe investigate Newton’s method as a root finder for complex polynomials of arbitrary degrees. While polynomial root finding continues to be one of the fundamental tasks of computing, with essential use in all areas of theoretical mathematics, numerics, computer graphics and physics, known methods may have excellent theoretical complexity but cannot be used in practice, or are practically efficient but lack a successful theory behind them. We provide precise and strong upper bounds for the theoretical complexity of Newton’s method and show that it is near-optimal with respect to the known set of starting points that find all roots. This theoretical result is complemented by a recent implementation of Newton’s method that finds all roots of various polynomials of degree more than a billion, significantly faster than our upper bounds on the complexity indicate, and often much faster than established fast root finders. Newton’s method thus stands out as a method that has strong merits both from the theoretical and from the practical point of view. Our study is based on the known explicit set of universal starting points, for each degreed, that are guaranteed to find all roots of polynomials of degreed(appropriately normalized). We show that this set containsdpoints that converge very quickly to thedroots: the expected total number of Newton iterations required to find alldroots with precisionɛisO(d3 log3d+d log | log ε|), which can be further improved toO(d2 log4d+d log | log ε|). The key argument shows that many root finding orbits are ‘R-central’ in the sense that they stay forever in a disk of radiusR, and each iteration ‘uses up’ an explicit amountAn,k(ℓ)of area within this disk.
Thick hyperbolic repelling invariant Cantor sets and wild attractors
Authors: Ding Yiming , Xiao Jianrong 
Published: January 2023

Abstract
Let D be the set of

β
∈
(
1
,
2
]

such that f

β
is a symmetric tent map with finite critical orbit. For

β
∈
D

, by operating Denjoy-like surgery on f

β
, we constructed a C
1 unimodal map

g
˜

β

admitting a thick hyperbolic repelling invariant Cantor set which contains a wild attractor. The smoothness of

g
˜

β

is ensured by the effective estimation of the preimages of the critical point as well as the prescribed lengths of the inserted intervals. D is dense in

(
1
,
2
]

, and

g
˜

β

can not be

C

1
+
α

because the hyperbolic repelling invariant Cantor set of

C

1
+
α

map has Lebesgue measure equal to zero.
A global-local damage localization and quantification approach in composite structures using ultrasonic guided waves and active infrared thermography
Authors: Balasubramaniam Kaleeswaran , Sikdar Shirsendu , Ziaja Dominika , Jurek Michał , Soman Rohan , Malinowski Paweł 
Published: January 2023

Abstract
The paper emphasizes an effective quantification of hidden damage in composite structures using ultrasonic guided wave (GW) propagation-based structural health monitoring (SHM) and an artificial neural network (ANN) based active infrared thermography (IRT) analysis. In recent years, there has been increased interest in using a global-local approach for damage localization purposes. The global approach is mainly used in identifying the damage, while the local approach is quantifying. This paper presents a proof-of-study to use such a global-local approach in damage localization and quantification. The main novelties in this paper are the implementation of an improved SHM GW algorithm to localize the damages, a new pixel-based confusion matrix to quantify the size of the damage threshold, and a newly developed IRT-ANN algorithm to validate the damage quantification. From the SHM methodology, it is realized that only three sensors are sufficient to localize the damage, and an ANN- IRT imaging algorithm with only five hidden neurons in quantifying the damage. The robust SHM methods effectively identified, localized, and quantified the different damage dimensions against the non-destructive testing-IRT method in different composite structures.
Multiple poles resonances coupling with high sensitivity sensing for multiple bulging black phosphorus-based metasurface
Authors: Yang Nengxun , Wang Yixuan , Li Lingqiao , Ren Yang , He Zhihui , Cui Wei , Yang Zhimin , Lu Shaojun , Wu Xiongxiong , Bai Lang 
Published: January 2023

Abstract
Herein, a multiple bulging black phosphorus (BP)-based metasurface is proposed for studying its reflection responses and sensing performances through the finite-difference time-domain simulation method. It is shown that, the reflection dips are caused by the coupling between dipole resonance modes and poly-poles resonance modes. Moreover, the dipoles resonance modes and poly-poles resonance modes can mutually enhance and inhibit each other, and tunable reflection spectra can be realized by symmetrically and asymmetrically adjusting the bulging of the proposed BP-based metasurface. In addition, the reflection spectra as a function of the polarization of incident light are discussed. We can find that a dipole resonance mode on the vertical side at the direction of ZZ for BP is gradually fully excited, resulting in an additional obvious reflection dip as the polarization angle θ increases from 0° to 90°. Especially, the sensing performance with the maximum of sensitivity S = 1.5 μm/RIU can be realized in the proposed BP-based metasurface. The results may provide a way to design micro-nano plasmonic devices.
Manipulating topological intravalley and intervalley scatterings of inner edge states in hybrid nanoribbons
Authors: Lü Xiao-Long , Xie Hang , Yang Jia-En , Li Ru-Xue , Du Long , Chen Hua-Jin , Zhang Hui-sheng 
Published: January 2023

Abstract
We investigate the formation of inner edge states and their transport properties in hybrid nanoribbons. Some new inner edge states, such as spin-polarized, spin-valley-polarized and valley-polarized antichiral inner edge states, are obtained, different from the current existence of valley- and spin-valley-momentum locked inner edge states. We also obtain general formula of local bond current with the wave-function matching technique and use it to discover three interesting transport phenomena of the intravalley and intervalley scatterings that depend on the propagating direction, propagating path, spin mode and wave-vector mismatches between inner edge states. In particular, these transport phenomena are further used to design topological spin, spin–valley and valley filters and be representative for graphene, silicene, germanene and stanene, supporting a potential application of inner edge states, which are robust against random vacancies.
Visually capture quantum nonlocalities through quantum steering ellipsoid
Authors: Xing Ling-Ling , Yang Huan , Li Ze-Bin , Xu Zong , Kong Min , Zhang Gang 
Published: January 2023

Abstract
Quantum steering ellipsoid (QSE) can faithfully characterize arbitrary bipartite state, and provide a new method to visually investigate and capture various quantum nonlocalities. Note that the dissipation of quantum nonlocalities can be accelerated by the coupling between the system and the decoherence channel, which induces great challenges in detecting quantum nonlocalities. Herein, considering the scenario in which the subsystem of a two-qubit system is coupled with a decoherence channel, the quantum discord (QD) and concurrence are visually characterized and detected by employing the QSE. The results reveal that the QSE y and z semiaxes are responsible for the traits of the QD and concurrence under the bit flip channel. The x and y semiaxes dominate and visualize the QD and concurrence under the phase damping channel. Of particular note is that one can realize the detections of the QD and concurrence via the shape of the QSE. To be clearer, the disappearance of the QD can be ascertained according to a needle-shaped QSE or a vanishing QSE in the Bloch sphere. In contrast, one can witness the concurrence if the total semiaxis length is greater than one. Beyond this, our results visually reveal that quantum entanglement is a stronger quantum nonlocality than the QD from the perspective of geometry, and thus deepens the understanding of the quantum nonlocality.