bluuebunny/crossref_metadata_2025_split huggingface dataset:
Shortcut-to-adiabaticity quantum tripartite Otto cycle
Authors: Li Lunan , Li Hai , Yu Wenli , Hao Yaming , Li Lei , Zou Jian 
Published: November 2021

Abstract
For an Otto cycle there always exists a trade-off between the cycle efficiency and the output power due to the requirement of cycle length. The shortcut to adiabatic (STA) technology provides an effective way to deal with the difficulty of zero-output power in conventional Otto cycle. In this paper, the Otto cycle of three-qubit system as the working substance with counterdiabatic driving has been investigated. It is demonstrated that the tripartite Otto cycle as a universal machine, in the suitable regimes of external control parameter, could work as a quantum heat engine (QHE), refrigerator or heat pump. And, the performances of QHE and refrigerator with and without STA, such as the power and efficiency of QHE and the coefficient of performance (COP) and figure of merit (FOM) of refrigerator, have been investigated. It shows the application of STA scheme can lead to an effective enhancement in the performances of Otto cycle, including achievements of a high QHE’s/refrigerator’s power associated with a moderate QHE’s efficiency/COP of refrigerator. Especially, it is interesting that even in a short-time cycle the optimization of control parameters could arise a remarkable improvement in the efficiency (or COP) of STA QHE (refrigerator), approaching the ideal efficiency or COP of conventional Otto cycle with quasi-static process. Finally, with the aid of parameter optimization the trade-off regions between the efficiency and the power (the COP and the FOM) of STA Otto engine (refrigerator) have been advised.
Elastic scattering of slow electrons by carbon nanotubes
Authors: Amusia M Ya , Baltenkov A S 
Published: November 2021

Abstract
In this paper we calculate the cross sections for elastic scattering of slow electrons by carbon nanotubes. The corresponding electron–nanotube interaction is substituted by a zero-thickness cylindrical potential that neglects the atomic structure of real nanotubes, thus limiting the range of applicability of our approach to sufficiently low incoming electron energies. The strength of the potential is chosen to be the same as was used in describing the scattering of electrons by fullerene C60. We present results for total and partial electron scattering cross sections as well as their respective angular distributions, all with account of the five lowest angular momenta contributions. In the calculations we assumed that the incoming electron moves perpendicular to the nanotube axis, since an incoming electron along the axis moves freely.
Design of all-dielectric ultra-wideband transparent water-based absorber
Authors: Lu Yi , Chen Juan , Li Jianxing 
Published: November 2021

Abstract
In this paper, an all-dielectric water-based transparent absorber is proposed. It is composed of transparent resin material filled with water, thus achieving the characteristics of being all-dielectric and transparent. The simulation results show that the proposed absorber can achieve absorptivity of more than 90% in the frequency band of 7.28–28.22 GHz, and has good thermal stability and oblique incidence angular stability. The thickness of the absorber is only 6.5 mm, corresponding to 0.16λ
max∼0.61λ
min. The test results are in good agreement with the simulation results, which proves that the water-based absorber has good performance. It can be applied in the field of electromagnetic (EM) stealth, EM energy harvesting and EM shielding.
Cluster decay half-lives in trans-tin and transition metal region using RMF theory
Authors: Singh Ajeet , Shukla A , Gaidarov M K 
Published: November 2021

Abstract
In the present work, we have studied the alpha-like clusters (8Be, 12C, 16O, 20Ne, and 24Mg) decay half-lives in the trans-tin region for (106–116Xe, 108–120Ba, 114–126Ce, and 118–128Nd) and in transition metal region for (156–166Hf, 158–172W, 160–174Os, 166–180Pt, and 170–182Hg) nuclei. These half-lives have been calculated using the shape parametrization model of cluster decay in conjunction with the axially deformed relativistic mean-field model with the NL3* parameter set. They are also compared with the half-lives computed using the latest empirical relations, namely universal decay law and the scaling law was given by Horoi et al. It has been observed that in the trans-tin region the minimum cluster decay half-lives are found at nearly doubly magic or doubly magic daughter 100Sn nucleus (N
d = 50, N
d is the neutron number of the daughter nucleus) and in transition metal region at N
d = 82, which is a magic number. The Geiger–Nuttal plots of half-lives showing Q dependence for different alpha-like clusters from various cluster radioactive emitters are found to vary linearly.
Dzyaloshinskii–Moriya interaction determined from spin wave nonreciprocity and magnetic bubble asymmetry in Pt/Co/Ir/Co/Pt synthetic ferrimagnets
Authors: Koplak Oksana , Bezverkhnii Alexander , Sadovnikov Alexandr , Morgunov Roman , Hehn Michel , Bello Jean-Loïs , Fache Thibaud , Mangin Stephane 
Published: November 2021

Abstract
We present analysis of the effect of Dzyaloshinskii–Moriya interaction (DMI) on spin wave nonreciprocity and bubble expansion asymmetry in Pt/Co/Ir/Co/Pt synthetic ferrimagnets with perpendicular magnetic anisotropy. We propose analysis of the DMI by Brillouin light scattering technique (BLS) and Kerr microscopy (MOKE) in the presence of interlayer exchange coupling strongly changing spin wave dispersion law and field dependences of domain wall velocity in comparison with those observed earlier in Ir/Co/Pt structures with a single Co layer. We have determined DMI values of each Co layer from unusually inverted dependence of velocity of the domain wall on in-plane magnetic field. Opposite signs of effective fields and DMI fields in the two Co layers invert field dependence of the domain wall velocity. DMI energy determined from BLS is higher than values, determined by bubble expansion.
Imbalanced fault identification via embedding-augmented Gaussian prototype network with meta-learning perspective
Authors: Hou Rujie , Chen Zhenyi , Chen Jinglong , He Shuilong , Zhou Zitong 
Published: November 2021

Abstract
In practical engineering, the number of acquired fault samples from different categories can be vastly different due to the low probability of key equipment malfunctioning. When training the imbalanced data, many methods focus on balancing the number of samples or weights between different categories, which may be time-consuming and easy to over-fit. To address this problem, we propose the embedding-augmented Gaussian prototype network (EGPN), which applies a new training mechanism from the perspective of meta-learning. We only train the categories with large samples and the remaining categories only appear in the testing process to calculate untrained prototypes. EGPN includes a feature-embedding augmented module, weighted prototype module and metric module. Firstly, ordinary convolution and dilated convolution are mixed to capture different frequency bands simultaneously, and the residual attention module is added to highlight key features and suppress unimportant features. Different prototypes are calculated by weighting to the embedding vectors through the Gaussian covariance matrix. Finally, the classification is done according to the modified distance. The experiments in the two datasets indicate that the proposed method can effectively recognize the untrained categories with only a few samples used as the prototypes, and can tackle the problem of identifying imbalanced fault data efficiently.
Anisotropic strength behavior of single-crystal TATB
Authors: Kroonblawd Matthew P , Steele Brad A , Nelms Matthew D , Fried Laurence E , Austin Ryan A 
Published: November 2021

Abstract
High-rate strength behavior plays an important role in the shock initiation of high explosives, with plastic deformation serving to localize heat into hot spots and as a mechanochemical means to enhance reactivity. Recent simulations predict that detonation-like shocks produce highly reactive nanoscale shear bands in the layered crystalline explosive TATB (1,3,5-triamino-2,4,6-trinitrobenzene), but the thresholds leading to this response are poorly understood. We utilize molecular dynamics to simulate the high-rate compressive stress–strain response of TATB, with a focus on understanding flow behavior. The dependence of strength on pressure and loading axis (crystal orientation) is explored. The deformation mechanisms fall broadly into two categories, with compression along crystal layers activating a buckling/twinning mode and compression normal to the layers producing nanoscale shear bands. Despite the complexity of the underlying mechanisms, the crystal exhibits relatively straightforward stress–strain curves. Most of the crystal orientations studied show rapid strain softening following the onset of yielding, which settles to a steady flow state. Trajectories are analyzed using five metrics for local states and structural order, but most of these metrics yield similar distributions for these deformation mechanisms. On the other hand, a recently proposed measure of intramolecular strain energy is found to most cleanly distinguish between these mechanisms, while also providing a plausible connection with mechanochemically accelerated decomposition kinetics. Localization of intramolecular strain energy is found to depend strongly on crystal orientation and pressure.
Synthesis of vertically-aligned large-area MoS2 nanofilm and its application in MoS2/Si heterostructure photodetector
Authors: Lei Yong , Yang Xiaozhan , Feng Wenlin 
Published: November 2021

Abstract
Van der Waals heterostructures based on the combination of 2D transition metal dichalcogenides and conventional semiconductors offer new opportunities for the next generation of optoelectronics. In this work, the sulfurization of Mo film is used to synthesize vertically-aligned MoS2 nanofilm (V-MoS2) with wafer-size and layer controllability. The V-MoS2/n-Si heterojunction was fabricated by using a 20 nm thickness V-MoS2, and the self-powered broadband photodetectors covering from deep ultraviolet to near infrared is achieved. The device shows superior responsivity (5.06 mA W−1), good photodetectivity (5.36 × 1011 Jones) and high on/off ratio I
on/I
off (8.31 × 103 at 254 nm). Furthermore, the V-MoS2/n-Si heterojunction device presents a fast response speed with the rise time and fall time being 54.53 ms and 97.83 ms, respectively. The high photoelectric performances could be attributed to the high-quality heterojunction between the V-MoS2 and n-Si. These findings suggest that the V-MoS2/n-Si heterojunction has great potential applications in the deep ultraviolet-near infrared detection field, and might be used as a part of the construction of integrated optoelectronic systems.
Tips of tongues in the double standard family*
Authors: Banerjee Kuntal , Buff Xavier , Canela Jordi , Epstein Adam 
Published: November 2021

Abstract
We answer a question raised by Misiurewicz and Rodrigues concerning the family of degree two circle maps

F

λ

:
R
/
Z
→
R
/
Z

defined by

F

λ

(

x

)

≔
2
x
+
a
+

b

π

sin

(

2
π
x

)

with

λ
≔

(

a
,
b

)

∈
R
/
Z
×

(

0
,
1

)

.

We prove that if

F

λ

◦
n

−
i
d

has a zero of multiplicity three in

R
/
Z

, then there is a system of local coordinates

(

α
,
β

)

:
W
→

R

2

defined in a neighborhood W of λ, such that α(λ) = β(λ) = 0 and

F

μ

◦
n

−
i
d

has a multiple zero with μ ∈ W if and only if β
3(μ) = α
2(μ). This shows that the tips of tongues are regular cusps.
Novel derivation of equations of motion for a body falling with resistance
Authors: Chong Zhiwei , Wu Zhuoyi , Wei Yajun 
Published: November 2021

Abstract
The motion equations of a body under gravity and resistance linearly dependent on speed are usually analysed by solving differential equations. In this paper we report a derivation not explicitly involving differential equations but instead based on some elementary mathematical operations. The derivation uses only knowledge covered in a typical secondary school mathematics syllabus.
Enhancing the conversion efficiency of extreme ultraviolet light sources using a 2 µm wavelength laser
Authors: Yuan Y , Ma Y Y , Wang W P , Chen S J , Cui Y , Zi M , Yang X H , Zhang G B , Leng Y X 
Published: November 2021

Abstract
In this study, we use the FLASH radiation hydrodynamic code and the FLYCHK atomic code to investigate the energy conversion and spectra associated with laser–Sn target interactions with 1 and 2 µm wavelength lasers. We found that the conversion efficiency (CE) reached as much as 3.38% with the 2 µm laser, which is 1.48 percentage points higher than the 1 µm laser (CE = 1.9%). In addition, we analyzed the contribution of dominant ionization states to the emission spectrum for both lasers. We observed that the growths of the out-of-band emission eventually led to a broadening of the spectrum, resulting in a reduction of spectral purity for the 1 µm laser. By contrast, the emission main peaks were all centered near 13.5 nm for the 2 µm laser, which is beneficial for efficient emission of light with a 13.5 nm wavelength (relevant for nanolithographic applications).
Effect of a non-uniform magnetic field on two ion species plasma-wall transition
Authors: Deuja Atit , Basnet Suresh , Khanal Raju 
Published: November 2021

Abstract
Fluid theory has been employed to investigate the magnetized plasma-wall transition properties for two ion species plasmas with a uniform background of neutral gas density in the presence of an external magnetic field. The external applied magnetic field is parallel to the surface and its magnitude varies in the direction perpendicular to the surface. The governing equations of ion and electron fluids include ionization and collision with neutral atoms. A comparative study of transition parameters for non-uniform and uniform magnetic fields is performed at equal values of the magnetic flux density at x = 0. This study shows that the sheath region shrinks for the non-uniform magnetic field case, essentially in reason of the lower value of the average magnetic field intensity in the plasma-wall transition region. We introduce a figure of merit to quantify the nonuniformity of the magnetic field

(

B

m
a
x

−

B

m
i
n

)

/

B

m
a
x

, and show that for its value 0.21 it is possible to model the plasma-wall transition region considering the magnetic field as uniform and equal to its average value. Furthermore, we find that the density distribution of electrons close to the surface deviates from the Boltzmann distribution due to the influence of a strong magnetic field.
Fabrication and electroluminescence properties of alloyed CdS
x
Se1−x
quantum dots-based LEDs
Authors: Nguyen Huu Tuan , Chen Shutang , Duong Anh Tuan , Lee Soonil 
Published: November 2021

Abstract
We report on the facile synthesis of alloyed CdS
x
Se1−x
quantum dots (QDs) via a one-pot method using the simultaneous injection of Se and S source into a solution of the Cd precursor dissolved in a coordinating mixture of hexadecylamine and trioctylphosphine, during which the formation of CdS
x
Se1−x
nanocrystals was controlled by growth time at a temperature of 260 °C. In particular, the emission peak and full width at half maximum of the photoluminescence (PL) of alloyed CdS
x
Se1−x
QDs were tunable in the range of 588–604 nm and 36–38 nm, respectively, with a PL quantum yield of up to 55% by a reaction time of 60 min. Importantly, the structural advantage of alloyed CdS
x
Se1−x
QDs-based light emitting devices have been fabricated and their electroluminescence properties characterized. A good performance device with a maximum luminance and luminous efficiency of 761 cd m−2 and 0.82 cd A−1, respectively, was obtained.
Experimental study on mechanical properties of large NiTi superelastic shape memory alloy bars
Authors: Ning Qiujun , Zhu Lihua , Han Wei , Zhao Cheng 
Published: November 2021

Abstract
This study intensively examined the mechanical properties of large-sized superelastic shape memory alloy (SMA) bars, mainly focusing on their self-centering and energy dissipation capabilities. A detailed investigation on the effects of the heat treatment strategy, loading rate, strain amplitude, cyclic loading, prestress, and diameter of the SMA bars on their mechanical performance—residual strain, energy dissipation, equivalent viscous damping ratios, strength, and stiffness—was conducted. Furthermore, the fracture microstructure of monotonic tensile specimens was analyzed via scanning electron microscopy. The results indicated that the optimally heat-treated SMA bars show good superelasticity. The mechanical properties were relatively stable under constant strain loading–unloading training, which should be considered in engineering applications. The test results provided basic experimental data support for the engineering application of large SMA bars.
Broadband vibration energy harvester based on nonlinear magnetic force and rotary pendulums
Authors: Yan Qiang , Dai Xianzhi , Zhang Zhang , Wang Lijun , Wang Yong 
Published: November 2021

Abstract
A broadband vibration energy harvester based on nonlinear magnetic force and rotary pendulums is proposed in this paper. The harvester is mainly composed of a magnetoelectric transducer and a rotary pendulum fixed with four permanent magnets. In order to improve the working bandwidth of the harvester, two pairs of permanent magnets are added in the middle of the rotary pendulum by using magnetic nonlinearity. The mechanical–magnetic–electrical analytical model of the harvester is established, and the theoretical value obtained by the model is basically consistent with the experimental value. The results show that the harvester has a strong nonlinearity through the magnetic force. When the acceleration is 0.4 g, some typical testing results are as follows: the resonant frequency is 19 Hz, maximum peak–peak voltage is 94.1 V, half power bandwidth is 15.8 Hz, center frequency is 26.9 Hz, and the ratio of half power bandwidth to the center frequency is 58.73

%

.
Temperature oscillation in one-dimensional superlattice induced by phonon localization
Authors: Lu Longkai , Ma Dengke , Zhong Ming , Zhang Lifa 
Published: November 2021

Abstract
Thermal transport properties and thermodynamic quantities often present anomalous behaviors in low-dimensional systems. In this paper, it is found that temperature oscillates spatially in one-dimensional harmonic and weakly anharmonic superlattice. With the increase of anharmonicity, the temperature oscillation gradually disappears and a normal temperature gradient forms. Further analysis reveals that the formation of temperature oscillation is due to the localization of high frequency phonons which cannot be thermalized. Moreover, the localized modes interact weakly with heat reservoirs, thus, their contributions to local temperature remain negligible while varying the temperatures of heat reservoirs. The oscillated temperature profile is in a good agreement with Visscher’s formula. The temperature oscillation discovered here has great potential in applications of phononic devices for heat manipulation.
Molecule–molecule and atom–molecule collisions with ultracold RbCs molecules
Authors: Gregory Philip D , Blackmore Jacob A , Matthew D Frye , Fernley Luke M , Bromley Sarah L , Hutson Jeremy M , Cornish Simon L 
Published: November 2021

Abstract
Understanding ultracold collisions involving molecules is of fundamental importance for current experiments, where inelastic collisions typically limit the lifetime of molecular ensembles in optical traps. Here we present a broad study of optically trapped ultracold RbCs molecules in collisions with one another, in reactive collisions with Rb atoms, and in nonreactive collisions with Cs atoms. For experiments with RbCs alone, we show that by modulating the intensity of the optical trap, such that the molecules spend 75% of each modulation cycle in the dark, we partially suppress collisional loss of the molecules. This is evidence for optical excitation of molecule pairs mediated via sticky collisions. We find that the suppression is less effective for molecules not prepared in the spin-stretched hyperfine ground state. This may be due either to longer lifetimes for complexes in the dark or to laser-free decay pathways. For atom–molecule mixtures, RbCs + Rb and RbCs + Cs, we demonstrate that the rate of collisional loss of molecules scales linearly with the density of atoms. This indicates that, in both cases, the loss of molecules is rate-limited by two-body atom–molecule processes. For both mixtures, we measure loss rates that are below the thermally averaged universal limit.
Improving the steady-state coherence and entanglement of two coupled qubits via composite system-reservoir interactions
Authors: Li Xiao-Ming , Man Zhong-Xiao , Xia Yun-Jie 
Published: November 2021

Abstract
In this work, we study the improvement of steady-state coherence (SSC) and steady-state entanglement (SSE) of two coupled qubits by means of composite system-reservoir interaction constructed by a linear combination of orthogonal and parallel ones. We show that in the non-equilibrium case, the SSC and SSE can be significantly enhanced by increasing the parallel components of the interaction Hamiltonian between the system of interest and the heat reservoirs. In addition, we find that in the non-equilibrium case, increasing the parallel components can enlarge the temperature (temperature difference) region where the SSC can maintain nonzero values. In the equilibrium situation, however, the SSC and SSE are not affected by the parallel components of the composite system-reservoir interactions.
Evolutionary heuristic with Gudermannian neural networks for the nonlinear singular models of third kind
Authors: Sabir Zulqurnain , Wahab Hafiz Abdul 
Published: November 2021

Abstract
The presented research work articulates a new design of heuristic computing platform with artificial intelligence algorithm by exploitation of modeling with feed-forward Gudermannian neural networks (FFGNN) trained with global search viability of genetic algorithms (GA) hybrid with speedy local convergence ability of sequential quadratic programing (SQP) approach, i.e., FFGNN-GASQP for solving the singular nonlinear third order Emden-Fowler (SNEF) models. The proposed FFGNN-GASQP intelligent computing solver Gudermannian kernel unified in the hidden layer structure of FFGNN systems of differential operators based on the SNEF that are arbitrary connected to represent the error-based merit function. The optimization objective function is performed with hybrid heuristics of GASQP. Three problems of the third order SNEF are used to evaluate the correctness, robustness and effectiveness of the designed FFGNN-GASQP scheme. Statistical assessments of the performance of FFGNN-GASQP are used to validate the consistent accuracy, convergence and stability.
Feynman kernel analytical solutions for the deformed hyperbolic barrier potential with application to some diatomic molecules
Authors: M’hamed Ezzine M , Hachama M , Diaf A 
Published: November 2021

Abstract
In this paper, we derive the ℓ-states energy spectrum of the q-deformed hyperbolic Barrier Potential. Within the Feynman path integral formalism, we propose an appropriate approximation of the centrifugal term. Then, using Euler angles and the isomorphism between Λ3 and SU(1, 1), we convert the radial path integral into a maniable one. The obtained eigenvalues are in very good agreement with the numerical results. In addition, we applied our results to some diatomic molecules and obtained accurate results compared to the experimental (RKR) values.