bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitates
Authors: Nutor Raymond Kwesi , Wei Ran , Cao Qingping , Wang Xiaodong , Ding Shaoqing , Zhang Dongxian , Li Fushan , Jiang Jian-Zhong 
Published: November 2022

The high-temperature tensile deformation behaviors of the recrystallization annealed Al7(CoNiV)93 medium entropy alloy with a duplex hierarchical microstructure of face-centered cubic (fcc) and ordered body-centered cubic L21 Heusler-type grains were investigated. The alloy showed a remarkably high tensile strength of ∼1.1 GPa and good ductility of ∼17% at 923 K due to a good strain hardening capacity of 60 MPa. At 1073 K, the highest fracture elongation of ∼270% was displayed at a strain rate of 10−3 s−1. The strain rate sensitivity was estimated to be about 0.32, which is typical of alloys that show this quasi-superplastic elongation. The activation energy was also estimated to be ∼421 kJ/mol. With deformation at 1073 K at a strain rate of 10−3 s−1, the duplex microstructure transformed into a refined triplex fcc-L21-σ equiaxed microstructure. The development of the triplex equiaxed microstructure resulted from dynamic recrystallization (DRX), which assisted in the maximum superplastic-like elongation of 270%. The inability of the alloy to access true superplasticity was attributed to immense cavitation due to the high amount of the brittle σ phase, which served as de-cohesion sites for the early fracture of the sample. However, the observed quasi-superplasticity could still be useful in superplastic forming operations.
Fine structure of the charge density wave in bulk VTe2
Authors: Duvjir Ganbat , Jung Jee-Ahn , Ly Trinh Thi , Lam Nguyen Huu , Chang Young Jun , Lee Sunghun , Kim Hanchul , Kim Jungdae 
Published: November 2022

Vanadium ditelluride (VTe2) has been intensively explored to understand the charge density wave (CDW) phase and its connection to magnetic properties. Here, we conduct a systematic study to understand the fine structure of CDW via scanning tunneling microscopy (STM) combined with density functional theory (DFT) calculations. STM topograph at 79 K shows that a CDW phase in VTe2 has a stripe modulation with 3 × 1 periodicity, following the double zigzag chain of distorted Te lattices. Interestingly, the 3 × 1 CDW modulation undergoes contrast inversion between filled and empty state topographs. Atomistic features and contrast changes of CDW observed in STM are clearly reproduced in our DFT simulation images. Charge distribution calculation indicates that the spatial extension and density of Te 5p orbitals have strong variations with filled and empty states, explaining the fine structure of 3 × 1 CDW in VTe2. Our finding provides an inspiring insight to further research on the less explored electronic structure of VTe2.
Measurement of amplification and absorption of a THz quantum-cascade metasurface free-space amplifier
Authors: Curwen Christopher A. , Shahili Mohammad , Addamane Sadhvikas J. , Reno John L. , Karasik Boris S. , Williams Benjamin S. , Kawamura Jonathan H. 
Published: November 2022

An active amplifying metasurface based on a quantum-cascade gain material at 2.7 THz is studied. The metasurface is first evaluated as the active component of an external cavity laser with excellent beam quality and frequency tunability from 2.55–2.8 THz. Amplification and absorption of the metasurface alone are then separately measured at a single frequency using a probe signal from a CO2-pumped gas laser operating at 2.743 THz. The metasurface reflectance vs bias is measured and compared with expectations from non-equilibrium Green’s function simulations of the quantum-cascade gain material and FEM simulations of the metasurface reflectance. A peak amplification on the order of 0.3 dB is measured. Design strategies are discussed for increasing single-reflection amplification (upward of 10 dB) and reducing power dissipation. Further increased amplification could be achieved by cascading multiple metasurfaces.
Estimation and sensitivity analysis of operational intervention levels for the early phase of radiological emergencies involving radioactive releases
Authors: Chandra Anirudh , Murali S 
Published: November 2022

Abstract
Radiological emergencies involving any likely atmospheric release of radioactive material in the public domain are quite a challenge to respond to and manage. Such conditions require a quick and confident response. One such response involves using pre-planned operational intervention levels (OILs) to trigger certain protective actions or groups of actions. OILs are typically derived for nuclear emergencies, whose values cannot always be directly used in a radiological incident. Therefore, in this study, OILs were derived for the early phase of a radiological emergency involving ground- and skin-deposition exposure scenarios. The methodology is an adaptation of an internationally recommended method for nuclear emergencies, with modifications to suit radiological incidents. The derived OILs for the radiological emergency were compared against the internationally recommended values to attest their adaptability. Nominal range sensitivity analysis was performed over 14 factors used in the methodology, which provided broad insights into their influence. Moreover, exhaustive sampling of the extreme values of these factors helped to derive operational margins for the OILs to cover all possible scenario variations. Based on this analysis, generic OILs for the early phase of a radiological emergency are proposed, such that the projected doses are well below the respective generic criteria, ensuring justification on radiological grounds.
Study of a realistic model for electrically charged anisotropic stars with a simplest non-interacting quark matter equation of state
Authors: Alrebdi H I , Errehymy Abdelghani , Singh Ksh Newton , Mustafa G , Abdel-Aty Abdel-Haleem , Daoud Mohammed 
Published: November 2022

Abstract
In this article a self bound quark star model that possesses some net electric charge is introduced. The quarks considered here are deconfined non-interacting Fermi gas. The solution has been found by solving Einstein-Maxwell field equations through MIT-bag equation of state and a metric potential. The obtained solution is further use to present a comparative studies of four compact stars 4U 1820-30, PSR J1903 + 327, Vela X-1 and PSR J1614-2230. The models are free from singularity, fulfil energy conditions, stability criteria and far within Buchdahl-Andreasson limit. Finally, we have predicted radii of these four compact objects.
Studies on high power second-harmonic deep-UV generation from a high repetition-rate Cu-HBr laser
Authors: Biswal R , Prakash O , Dixit S K 
Published: November 2022

Abstract
This paper presents, for the first time, comprehensive studies on high power second harmonic deep ultraviolet (UV: λ ≈ 255.3 nm) generation from a low temperature, high repetition rate (18 kHz) variant of copper laser (Cu-HBr laser) with different optical resonators (plane–plane resonator and unstable resonators of magnifications 12.5, 50 & 100), pump-beam focussing condition and pump powers. With a type-I, critically phase matched β-barium borate (BBO) crystal as the harmonic generator and different pump average powers (⩽10 W) of the laser, the variation in UV average output powers and its conversion efficiencies were studied. The average UV power and conversion efficiency as high as about 2 W and 26% respectively were achieved. The experimental results were analysed in light of the beam quality attributes of the pump beams vis-à-vis limiting thermal and walk-off effects associated.
Spectral optimization of Stokes channels for multi-wavelength Brillouin fiber lasers
Authors: Rebuli Giuliano S , Silva Luís C B , Pedruzzi Eduarda , Leal-Junior Arnaldo G , Segatto Marcelo E V , Castellani Carlos E S 
Published: November 2022

Abstract
In this paper, through a semi-analytical model, we demonstrate the spectral optimization of Stokes channels for cascaded multi-wavelength Brillouin fiber lasers. Here we develop an improved version of an earlier model, introducing the erbium-doped fiber amplifier gain saturation into the mathematical formalism of the laser, making our model more accurate. Our results reveal that with the proper selection of laser component parameters, it is possible to increase the number of generated Stokes channels significantly and generate them with high flatness. Specifically, 75 and 69 Stokes channels were generated within a 3.7 and 3 dB range, respectively.
Design of twist-microstructured based wideband single-circular-polarization single-mode fibers
Authors: Xiao Yue-Yu , Xu Xin-Yu , Yao Rui-Ming 
Published: November 2022

Abstract
We propose a novel twist-microstructured fiber design to achieve single-circular polarization single-mode (SCP-SM) transmission. It consists of a round core and three lobes of microstructured regions in cladding. The local modes existing in the microstructured regions make a large coupling coefficient between the fundamental guiding mode and the leaky cladding mode possible. The orthogonal random direction method is used to find the optimal structural parameters, and numerical results show that the bandwidth of efficient circular polarization selectivity for the proposed SCP-SM fiber is approximately 155 nm, ranging from 1400 nm to 1550 nm. The influence of varying the parameters of the microstructured cladding on the single circular polarization performance is also discussed.
Concentration effect on the optical properties of laser irradiation copper phthalocyanine (CuPc blue) solution
Authors: Ali Ejam Ahmed , Abdul Wahhab Nihal A 
Published: November 2022

Abstract
The work aims to study the effect of varying the concentrations on the optical properties of the organic copper phthalocyanine pigment before and after exposure to a laser beam of different wavelengths

650
,

532
,

and

405

nm

. The pigment was dissolved in chloroform solvent at room temperature and in several concentrations

0.05
,

0.1
,

and

0.2

g

l

−
1

. The optical properties including the spectrum of absorbance, transmittance, and reflectivity are measured. The work also presents the energy gap data that was calculated from the Tauc equation for all concentrations. The results showed that the band gap decreases with increasing solution concentration. The band gap is measured using both Tauc and fluorescence method, and the values are compared at concentration

0.2

g

l

−
1

. The optical parameters such as absorption coefficient, extinction coefficients, refractive index, dielectric constants, and optical conductivity are increased with increasing laser time irradiation for all solution concentrations.
Noise induced escape from stable invariant tori
Authors: Zhao Feng , Li Yang , Liu Xian-bin 
Published: November 2022

Abstract
In the present paper, the noise-induced escape from stable invariant tori with the frame of general Langevin dynamics is investigated under weak random perturbations. Based on the large deviation theory, the quasi-potential, a quantity exponentially dominating the mean first escape time and the stationary or quasi-stationary probability density, is explored both analytically and numerically. The results show that whether the stochastic trajectories are ergodic on a torus has a crucial influence on the behavior of the quasi-potential. Specifically, there are two sources of ergodicity. One is the ergodicity of the deterministic flow, and the other requires the nondegeneracy of the noise in the tangential directions of a torus. It is found that if the ergodicity holds, the quasi-potential will be independent of the initial position on a torus, but not when the ergodicity is broken. In particular, it indicates that, for nonlinear systems driven by combined Gaussian white noise and multiple harmonic excitations, the mean first exit time varies discontinuously with respect to the frequency vector of these harmonic excitations as the noise intensity approaches zero. Adding noise to the phase of these harmonic excitations will eliminate the dependence on the initial position and thus, make the systems more robust. It reminds us that great care must be taken when dealing with noise-induced problems involving systems that possess unstable geometric structures.
A one-time sampling method for the real-time measurement of bunch-by-bunch three-dimensional positions in storage rings
Authors: Wu Ruizhe , Zhao Yunkun , Jin SanShuang , Tang Leilei , Lu Ping , Sun Baogen 
Published: November 2022

Abstract
Bunch-by-bunch (BbB) technique, which allows accelerator
physicists to monitor beam information on finer timescales, is an
efficient tool for studying longitudinal and transverse beam
dynamics. However, the real-time measurement in BbB technique can
only monitor one beam parameter, thus focusing only on the
longitudinal phase or transverse positions of bunches. Therefore, to
solve this issue, we put forward a one-time sampling method (OSM) to
evaluate the longitudinal phase and transverse positions of bunches
simultaneously, taking as one way of the real-time measurement for
BbB three-dimensional (3D) positions. And we carried out related
experiments in Hefei Light Source II and Shanghai Synchrotron
Radiation Facility. As a result, experiments show that OSM obtains
12 μm of x-direction resolution, 10 μm of
y-direction resolution, 0.57 ps of z-direction resolution at
Hefei Light Source II, and 10 μm of x-direction resolution,
10 μm of y-direction resolution, 0.35 ps of z-direction
resolution at Shanghai Synchrotron Radiation Facility. All these
experimental results reveal that OSM is feasible to measure the BbB
3D positions.
Locomotion performance for oscillatory swimming in free mode
Authors: Paniccia D , Padovani L , Graziani G , Piva R 
Published: November 2022

Abstract
Oscillatory swimming of a fishlike body, whose motion is essentially promoted by the flapping tail, has been studied almost exclusively in axial mode under an incoming uniform stream or, more recently, self-propelled under a virtual body resistance. Obviously, both approaches do not consider the unavoidable recoil motions of the real body which have to be necessarily accounted for in a design procedure for technological means. Actually, once combined with the prescribed kinematics of the tail, the recoil motions lead to a remarkable improvement on the resulting swimming performance. An inviscid impulse model, linear in both potential and vortical contributions, is a proper tool to obtain a deeper comprehension of the physical events with respect to more elaborated flow interaction models. In fact, at a first look, the numerical results seem to be quite entangled, since their trends in terms of the main flapping parameters are not easy to be identified and a fair interpretation is obtained by means of the model capability to separate the effects of added mass and vortex shedding. Specifically, a prevailing dependence of the potential contribution on the heave amplitude and of the vortical contribution on the pitch amplitude is instrumental to unravel their combined action. A further aid for a proper interpretation of the data is provided by accounting separately for a geometrical component of the recoil which is expected to follow from the annihilation of any spurious rigid motion in case no fluid interactions occur. The above detailed decomposition of the recoil motions shows, through the numerical results, how the single components are going to influence the main flapping parameters and the locomotion performance as a guide for the design of biomimetic swimmers.
3D-bioprinting of aortic valve interstitial cells: impact of hydrogel and printing parameters on cell viability
Authors: Immohr Moritz Benjamin , Dos Santos Adrego Fabió , Teichert Helena Lauren , Schmidt Vera , Sugimura Yukiharu , Bauer Sebastian , Barth Mareike , Lichtenberg Artur , Akhyari Payam 
Published: November 2022

Abstract
Calcific aortic valve disease (CAVD) is a frequent cardiac pathology in the aging society. Although valvular interstitial cells (VICs) seem to play a crucial role, mechanisms of CAVD are not fully understood. Development of tissue-engineered cellular models by 3D-bioprinting may help to further investigate underlying mechanisms of CAVD. VIC were isolated from ovine aortic valves and cultured in Dulbecco’s modified Eagle’s Medium (DMEM). VIC of passages six to ten were dissolved in a hydrogel consisting of 2% alginate and 8% gelatin with a concentration of 2 × 106 VIC ml−1. Cell-free and VIC-laden hydrogels were printed with an extrusion-based 3D-bioprinter (3D-Bioplotter® Developer Series, EnvisionTec, Gladbeck, Germany), cross-linked and incubated for up to 28 d. Accuracy and durability of scaffolds was examined by microscopy and cell viability was tested by cell counting kit-8 assay and live/dead staining. 3D-bioprinting of scaffolds was most accurate with a printing pressure of P < 400 hPa, nozzle speed of v < 20 mm s−1, hydrogel temperature of T
H = 37 °C and platform temperature of T
P = 5 °C in a 90° parallel line as well as in a honeycomb pattern. Dissolving the hydrogel components in DMEM increased VIC viability on day 21 by 2.5-fold compared to regular 0.5% saline-based hydrogels (p < 0.01). Examination at day 7 revealed dividing and proliferating cells. After 21 d the entire printed scaffolds were filled with proliferating cells. Live/dead cell viability/cytotoxicity staining confirmed beneficial effects of DMEM-based cell-laden VIC hydrogel scaffolds even 28 d after printing. By using low pressure printing methods, we were able to successfully culture cell-laden 3D-bioprinted VIC scaffolds for up to 28 d. Using DMEM-based hydrogels can significantly improve the long-term cell viability and overcome printing-related cell damage. Therefore, future applications 3D-bioprinting of VIC might enable the development of novel tissue engineered cellular 3D-models to examine mechanisms involved in initiation and progression of CAVD.
Geometric-arithmetic master equation in large and fast open quantum systems
Authors: Davidović Dragomir 
Published: November 2022

Abstract
Understanding nonsecular dynamics in open quantum systems is addressed here, with emphasis on systems with large numbers of Bohr frequencies, zero temperature, and fast driving. We employ the master equation, which replaces arithmetic averages of the decay rates in the open system, with their geometric averages, and find that it can improve the second order perturbation theory, known as the Redfield equation, while enforcing complete positivity on quantum dynamics. The characteristic frequency scale that governs the approximation is the minimax frequency: the minimum of the maximum system oscillation frequency and the bath relaxation rate; this needs to be larger than the dissipation rate for it to be valid. The concepts are illustrated on the Heisenberg ferromagnetic spin-chain model. To study the accuracy of the approximation, a Hamiltonian is drawn from the Gaussian unitary ensemble, for which we calculate the fourth order time-convolutionless master equation, in the Ohmic bath at zero temperature. Enforcing the geometric average, decreases the trace distance to the exact solution. Dynamical decoupling of a qubit is examined by applying the Redfield and the geometric-arithmetic master equations, in the interaction picture of the time dependent system Hamiltonian, and the results are compared to the exact path integral solution. The geometric-arithmetic approach is significantly simpler and can be super-exponentially faster compared to the Redfield approach.
Thermodynamics of the infinity-range hubbard model in the spin-incoherent regime
Authors: O Ramos Gabriel F , Coutinho-Filho Mauricio D 
Published: November 2022

Abstract
The infinity-range Hubbard model on a d-dimensional hypercubic lattice is mapped onto an ideal gas with three species obeying the Haldane-Wu fractional exclusion statistics (FESs). Using this map, we study this system in the spin-incoherent regime and strong coupling limit. We have derived the polynomial series of the grand-canonical free, whose coefficients are Lerch functions, a signature of our FES description, as demonstrated for the entropy and specific heat in any dimension. For even dimensions the series are finite, and a table of coefficients versus dimensionality can be written, while for odd dimensions, the series diverges asymptotically, and can thus be circumvented by Borel summation.
Silicone implant surface roughness, friction, and wear
Authors: Atkins Dixon J , Chau Allison L , Rosas Jonah M , Chen Yen-Tsung , Chan Samantha T , Manuel Urueña Juan , Pitenis Angela A 
Published: November 2022

Abstract
Some textured silicone breast implants with high average surface roughness (‘macrotextured’) have been associated with a rare cancer of the immune system, Breast Implant-Associated Anaplastic Large Cell Lymphoma (BIA-ALCL). Silicone elastomer wear debris may lead to chronic inflammation, a key step in the development of this cancer. Here, we model the generation and release of silicone wear debris in the case of a folded implant-implant (‘shell-shell’) sliding interface for three different types of implants, characterized by their surface roughness. The ‘smooth’ implant shell with the lowest average surface roughness tested (Ra = 2.7 ± 0.6 μm) resulted in average friction coefficients of μ
avg = 0.46 ± 0.11 across 1,000 mm of sliding distance and generated 1,304 particles with an average particle diameter of D
avg = 8.3 ± 13.1 μm. The ‘microtextured’ implant shell (Ra = 32 ± 7.0 μm) exhibited μ
avg = 1.20 ± 0.10 and generated 2,730 particles with D
avg = 4.7 ± 9.1 μm. The ‘macrotextured’ implant shell (Ra = 80 ± 10 μm) exhibited the highest friction coefficients, μ
avg = 2.82 ± 0.15 and the greatest number of wear debris particles, 11,699, with an average particle size of D
avg = 5.3 ± 3.3 μm. Our data may provide guidance for the design of silicone breast implants with lower surface roughness, lower friction, and smaller quantities of wear debris.
Linear nonsaturating magnetoresistance in kagome superconductor CsV3Sb5 thin flakes
Authors: Wei Xinjian , Tian Congkuan , Cui Hang , Li Yongkai , Liu Shaobo , Feng Ya , Cui Jian , Song Yuanjun , Wang Zhiwei , Chen Jian-Hao 
Published: November 2022

Abstract
Linear nonsaturating magnetoresistance (LMR) represents a class of anomalous resistivity response to external magnetic field that has been observed in a variety of materials including but not limited to topological semi-metals, high-T
c superconductors and materials with charge density wave (CDW)/spin density wave orders. Here we report the observation of LMR in layered kagome superconductor and CDW material CsV3Sb5 thin flakes, as well as the dimensional crossover and temperature (T) crossover of such LMR. Specifically, in ultrathin CsV3Sb5 crystals, the magnetoresistance (MR) exhibits a crossover from LMR at low T to quadratic B dependence above the CDW transition temperature; the MR also exhibits a crossover from LMR to sublinear MR for sample thickness at around ∼20 nm at low T. We discuss several possible origins of the LMR and attribute the effect to two-dimensional CDW fluctuations. Our results may provide a new perspective for understanding the interactions between competing orders in kagome superconductors.