bluuebunny/crossref_metadata_2025_split huggingface dataset:
All-optical logic gates based on topological edge and corner states in two-dimensional photonic crystals with square dielectric columns
Authors: Gao Yong-Feng , Zhou Shu-Yang , Li Yue , Pan Ji-Ning , He Yue , Yang Ming , Sun Ming-Yang 
Published: December 2023

Abstract
Recently, with the rapid progress in all-optical networks and optical computing, there is an increasing requirement for more appropriate methods to design all-optical logic gates. Photonic crystals (PCs) can be serving as a versatile platform for manipulating light propagation. The realization of topological edge states (TESs) and topological corner states (TCSs) within high-order topological photonic insulators has attracted extensive attention. In this paper, TESs and TCSs are achieved using honeycomb PCs with square dielectric columns instead of conventional cylindrical ones for obtaining a larger photonic energy band gap due to reduction of dielectric column symmetry. TESs with overlapping frequencies can be attained by different arrangements of combining two PCs with distinct topological properties. A sandwich structure comprising both topologically trivial and non-trivial PCs is proposed, and ‘AND Gate’ and ‘OR Gate’ logic gates are implemented through the coupling between edge state waveguides when controlling the number of coupling layers. Additionally, a triangular-shaped box structure composed of non-trivial PCs enveloped by trivial PCs is constructed. Within this structure, TCSs manifest only around each acute angle, and a ‘NOT Gate’ logic gate is realized through corner state coupling and edge state coupling. This work paves a new way of designing high-performance micro–nano all-optical logic gate devices.
All-optical modulation of Fano-like resonances in apodized fiber Bragg grating using Er/Yb doped fiber
Authors: Wang Fan , Lin Siyu , Qu Yanchen , Han Xiaopeng , Wei Yuan , Zhao Zhenyu , Zhang Yundong 
Published: December 2023

Abstract
A novel all-optical scheme for fast modulation of Fano-like resonance using Er/Yb doped fiber (EYDF) is proposed and demonstrated experimentally. In the integrated system, an apodized fiber Bragg grating (AFBG) is inserted into one arm of the fiber Mach–Zehnder interferometer (MZI), and the asymmetric Fano-like resonances is generated by the interference between the MZI mode and AFBG mode. In addition, a section of EYDF is inserted into the other arm of the MZI to control the phase difference between the two arms of the MZI. By adjusting the power of optical pump applied to the EYDF, the transmission spectrum lineshapes of the integrated device can be effectively modulated into asymmetric Fano-like resonances, symmetric transmission dip or electromagnetically induced transparency-like resonances, which has a fast response speed. The proposed all-optical Fano-like modulation scheme is simple in structure, and has advantages of remote control and long-term stability, providing potential applications in the fields of fast and slow light, optical filters and fiber sensing.
Absolute deformation potentials and absolute energy levels of III-N, ZnO, and II-IV-N2 semiconductors for optoelectronic applications
Authors: Luo Hongxu , Wu Wenhao , Lyu Sai 
Published: December 2023

Abstract
Absolute deformation potentials and absolute energy levels for III-N, ZnO, and II-IV-N2 semiconductors are systematically determined from hybrid-functional calculations. Separate bulk and slab calculations are combined and the vacuum level is taken as the common reference. The trends in the absolute deformation potentials are rationalized by the kinetic energy effect and the bonding (or antibonding) character of the band edge states. The calculated absolute energy levels can be used to obtain the natural band alignment between these semiconductors and are in accordance with the available results. The determined parameters are of practical importance to the optoelectronic devices designs.
Attention mechanism guided sparse filtering for mechanical intelligent fault diagnosis under variable speed condition
Authors: Han Rui , Wang Jinrui , Wan Yanbin , Bao Jihua , Jiang Xue , Zhang Zongzhen , Han Baokun , Ji Shanshan 
Published: December 2023

Abstract
Variable speed is one of the common working conditions of mechanical equipment, which poses an important challenge to equipment fault diagnosis. The current solutions have the shortcomings of low computational efficiency and large diagnostic errors. The ability of attention mechanism to automatically extract useful features has begun to attract widespread attention in the field of mechanical intelligent fault diagnosis. Combining the advantages of attention mechanism and unsupervised learning, this paper proposes a squeeze-excitation attention guided sparse filtering (SESF) method for mechanical intelligent fault diagnosis method under variable speed. Firstly, the squeeze-excitation attention mechanism is embedded in sparse filtering algorithm to guide model training. Then, unsupervised feature extraction is carried out on multi-scale inputs from the variable speed signal samples. The training results are adaptively screened and weighted to make the model pay more attention to the region with the most classify discrimination, so as to improve the feature extraction ability of the model to obtain useful information. Finally, two sets of gear and bearing tests under variable speed condition are adopted to testify the performance of the proposed method. The experimental results show that the SESF method can overcome the influence of variable speed to achieve accurate recognition of different mechanical faults and is superior to the other methods.
Oxalic acid-assisted preparation of LTO-carbon composite anode material for lithium-ion batteries
Authors: Murashko Kirill , Karhunen Tommi , Meščeriakovas Arūnas , Subedi Nabin , Lähde Anna , Jokiniemi Jorma 
Published: December 2023

Abstract
This study presents an oxalic acid-assisted method for synthesizing spinel-structured lithium titanate (Li4Ti5O12; LTO)/carbon composite materials. The Ag-doped LTO nanoparticles (NPs) are synthesized via flame spray pyrolysis (FSP). The synthesized material is used as a precursor for synthesizing the LTO-NP/C composite material with chitosan as a carbon source and oxalic acid as an additive. Oxalic acid improves the dissolution of chitosan in water as well as changes the composition and physical and chemical properties of the synthesized LTO-NP/C composite material. The oxalic acid/chitosan ratio can be optimized to improve the electrochemical performance of the LTO-NP/C composite material, and the electrode synthesized with a high mass loading ratio (5.44 mg cm−2) exhibits specific discharge capacities of 156.5 and 136 mAh g−1 at 0.05 C- and 10 C-rate currents, respectively. Moreover, the synthesized composite LTO-NP/C composite material exhibits good cycling stability, and only 1.7% decrease in its specific capacity was observed after 200 charging–discharging cycles at 10 C-rate discharging current.
Coulomb blockade and Coulomb staircases in CoBi nanoislands on SrTiO3 (001)
Authors: Xia Yumin , Cai Desheng , Gao Jiaqing , Li Pengju , Xie Kun , Liu Yuzhou , Gu Yitong , Yu Gan , Cui Ping , Qin Shengyong 
Published: December 2023

Abstract
We successfully fabricated two-dimensional metallic CoBi nanoislands on SrTiO3 (001) substrate by molecular beam epitaxy, and systematically investigated their electronic structures by scanning tunneling microscopy and spectroscopy in situ at 4.2 K. Coulomb blockade and Coulomb staircases with discrete and well-separated levels are observed for the individual nanoisland, which is attributed to single-electron tunneling via two tunnel junction barriers. They are in excellent agreement with the simulations based on orthodox theory. Furthermore, we demonstrated that the Coulomb blockade becomes weaker with increasing temperature and almost disappears at ∼22 K in our variable temperature experiment, and its full-width at half-maximum of dI/dV peaks with temperature is ∼6 mV. Our results provide a new platform for designing single-electron transistors that have potential applications in future microelectronics.
4D printing of porous PLA-TPU structures: effect of applied deformation, loading mode and infill pattern on the shape memory performance
Authors: Rahmatabadi Davood , Soltanmohammadi Kianoosh , Aberoumand Mohammad , Soleyman Elyas , Ghasemi Ismaeil , Baniassadi Majid , Abrinia Karen , Bodaghi Mahdi , Baghani Mostafa 
Published: December 2023

Abstract
For the first time, the synergy of shape memory polymer (SMP) blending, 4D printing, and cold programming (CP) are investigated for improving the functionality of the shape memory effect (SME), increasing medical applications of porous structures, direct programming, and removing current limitations. Porous PLA-TPU structures with different printing patterns and applied deformation were CPed under constrained and non-constrained compression modes at room temperature and were recovered in the rubbery phase. The shape fixity and shape recovery ratios were calculated and the cross-section morphology was examined with scanning electron microscopy (SEM). The shape fixity values were in the range of 39.75%–71.27%, while almost complete shape recovery ratios (100%) were observed for all porous samples. Low shape fixity ratios can be justified due to the existence of two steps of spring-back and structure relaxation after unloading in cold programming, resulting from elastic and viscoelastic behavior. The glass transition temperature of the PLA-TPU blend was 69 °C and shifted to raw materials, indicating the possibility of some interaction between the two components. SEM images showed the uniform distribution of TPU particles and matrix-droplet morphology in the PLA-TPU blend. After printing, TPU droplets were stretched and the sea-island morphology was observed in some segments.
Tight focusing of azimuthally polarized Laguerre–Gaussian vortex beams by diffractive axicons
Authors: Alkelly Abdu A , Al-Ahsab Hassan T , Cheng Mingjian , Loqman Ibrahim G H 
Published: December 2023

Abstract
This study presents a comprehensive theoretical investigation into the focusing properties of azimuthally polarized Laguerre–Gaussian vortex (APLGV) beams when interacting with different optical elements, including a linear axicon, binary axicon, and lens based on the Debye approximation. The research findings highlight the intriguing combination of polarization and vortex singularities within the APLGV beam, which result in distinctive focal shapes when interacting with these optical elements. The focal shapes achieved include multiple tightly focused spots and optical needles, which can be controlled by adjusting optical system parameters and beam characteristics such as the numerical aperture (NA), truncation parameter, beam order, and annular obstruction. These parameters can be carefully selected to achieve specific focal shapes with applications in multi-optical manipulation, particle acceleration, and trapping. By harnessing the unique properties of APLGV beams and optimizing the optical setup, researchers can explore new possibilities for advanced optical manipulation and control.
Electromagnetic scattering of cylindrical artificial electron cloud by using parabolic equation method
Authors: Wang Yao-Wu , Xu Zheng-Wen , Zhao Hai-Sheng , Xue Kun 
Published: December 2023

Abstract
The ionizable metal vapor released in the ionosphere can artificially generate space electron clouds. They can scatter radio waves at decameter and meter wavelengths so as to realize over-the-horizon propagation. Based on the parabolic equation (PE) method and using Padé-(1,1) polynomial, the electromagnetic scattering characteristics of cylindrical artificial electron clouds are preliminarily studied in this letter. The bistatic radar scattering cross section (RCS) and the ground received field distribution via artificial electron cloud are calculated for various incidence angles at different radio frequencies and distances. The PE method is used here since its advantages of high precision, fast computing and less computing resource occupation over traditional methods. The study of electromagnetic scattering is valuable to the follow-up release experiments for generating electron cloud. It throws a new light on the practical utilization of over-the-horizon radio communication via scattering channel of artificial electron clouds.
Novel data encryption scheme and its application to secure multi-party communication
Authors: Wu Jingjin , Long Guoqiang , Wang Canhua , Wu Jianhua 
Published: December 2023

Abstract
Recent advances in cellular mobile telecommunication field have dramatically facilitated the multi-party collaborative work in social networks. However, the privacy issues exposed by insecure network channels and semi-trusted service providers, such as underlying data analysis and mining, have gradually aroused public concerns. In this context, a novel Multi-Party Privacy Data Encryption (MP-PDE) scheme built upon the deep learning framework is proposed. In this scheme, a four-dimensional autonomous chaotic system is initially leveraged to configurate the key-controlled cipher streams. Under the guidance of a multi-objective optimization function, the proposed encryption network manipulates the multi-party private data into a cipher image with the statistical pseudo-randomness. At the recipient side, distinct participants can decrypt the corresponding data availing their own licensing key from the identical cipher image. Furthermore, the encryption and decryption networks are equivalent except for their trainable network parameters. Finally, numerous experiments are conducted to verify the effectiveness and security of the proposed scheme.
Dynamics of high-power coupled nonlinear oscillator arrays for electronic beam steering technique: case of the triode based van der Pol oscillator
Authors: Tsefack Merlin Brice Saatsa , Tegnitsap Joakim Vianney Ngamsa , Fotsin Hilaire Bertrand , Ngouonkadi Elie Bertrand Megam 
Published: December 2023

Abstract
This paper presents the dynamics of coupled nonlinear oscillator arrays (CNOAs) as phase shifter for electronic beam steering technique. The proposed phase shifter uses oscillators of van der Pol type with a fifth-order nonlinear resistance and is built on the two architectures based injection-locked oscillator array (ILOAs) and coupled oscillator arrays (COAs). The dynamics equations of the phase shifter are proposed in the frequency and time domain. With the help of mathematical tools such as bifurcation diagrams, maximum Lyapunov exponent and Hilbert transform, important cartography of different oscillating states is deduced over large range of system parameters. Different behavior of the CNOAs including chaos, 2D-torus, multistability, locked and unlocked states are depicted. The phase shift between output voltages of each pair of coupled oscillators is presented for both architectures. A detailed analysis of locked states shows that the required phase shift is synthesized by slightly varying the frequency of the injected signal, or simply by detuning the free-running frequencies of the edge oscillators in equal but opposite directions. The proposed circuit of the phased shifter is built using the original van der Pol oscillator based on a vacuum triode. The maximal phase shift reaches

63
°

and

75
°

respectively for ILOAs and COAs. With the presence of triode in the circuit, the output voltage of each oscillating element in the array reaches

100

V

around

60

KHz

and is boosted by increasing the value of the triode bias potential to more than

420

V
.

This, therefore, increases the total power dissipation of a single oscillator in the array to more than

47

dB

(

50.12

W

). This circuit is a candidate for high-power electronics beam steering at ultrasonic frequency.
Behavioral propagation influenced by fluctuating personality on single-layer limited-contact network
Authors: Zhu Xuzhen , Zhang Junheng , Liu Siyuan , Tian Yang , Cui Yajuan , Li Yujie , Ma Jinming 
Published: December 2023

Abstract
In daily life, everyone has some degree of fluctuating personality, which is often manifested when making major decisions. To study the influence of fluctuating personality in behavioral propagation, we build a network model that is distinguished by a single layer and limited contact, and involves individuals with fluctuating personalities. At the same time, the impact of individual limited contact ability and network heterogeneity on information dissemination is studied. Based on this, we analyze the effect of personality fluctuations on the information propagation mechanism in complex networks using the theory of generalized edge partitioning. Finally, the study found a crossover phase transition phenomenon in the propagation process. In this model, as the fluctuation of personality becomes stronger, the final adoption range increases continuously with the increase of the propagation rate. In addition, when the frequency of psychological fluctuations of individuals reaches a certain value, the model’s outbreak threshold and the final propagation range tend to be consistent. The outcomes of the theoretical analysis and the findings of the practical simulation accord well.
Mimicking states with limited resources: passing quantum quiz via global control
Authors: Pyshkin P V , Sherman E Ya , Gábris A , Wu Lian-Ao 
Published: December 2023

Abstract
Precise control of quantum systems with a moderate number of degrees of freedom, being of interest for application in quantum technologies, becomes experimentally feasible. Various types of quantum scenarios and protocols are being widely discussed in scientific literature. We propose, analyze, and optimize a protocol which allows fast simulation of properties of unknown quantum states relying on minimum relevant information. Our protocol, having common features with quantum identification and shortcuts to adiabaticity, permits avoiding orthogonality catastrophe, where transitions between physically very similar systems are characterized by zero or a very low fidelity.
Multi-chalcogenides CuAg-II-IV-VI: a first-principles exploration of promising absorbing materials for solar cell applications
Authors: Zhu Hanming , Liu Yingkai , Li Decong , Kang Kunyong 
Published: December 2023

Abstract
Cu2ZnSnS4 quaternary chalcogenides have attracted considerable attention owing to their remarkable photoelectric properties. However, the presence of antisite defects poses a significant obstacle to the further advancement of these chalcogenides. In this study, we employed a first-principles approach to assess 540 CuAg-II-IV-VI compounds based on structural stability, band gap, effective mass, and optical properties. The objective was to identify promising candidate materials for solar absorption. As indicated by the results, CuAgZnGeSe4, CuAgBeSnSe4, CuAgBeGeSe4, CuAgZnSiTe4, and CuAgBeSiTe4 exhibit ideal band gaps ranging from 1.45 to 1.58 eV, low effective masses, and high absorption coefficients in the visible light spectrum, comparable to the benchmark material Cu2ZnSnS4. The findings of this study present novel insights for the development of highly efficient multi-chalcogenide solar cells.
First-principles study of the effect of alkali metals on the electronic and optical properties of SnS2
Authors: Ma Mengting , Liu Guili , Su Dan , Wei Ran , Yang Zhonghua , Zhang Guoying 
Published: December 2023

Abstract
In this paper, the photovoltaic properties of alkali metal atom X ( X is Li, Na, K, and Rb) doped monolayer SnS2 system have been investigated based on first principles calculations. After the doping of alkali metal atoms, the bond lengths of the doped systems increase compared to the pure SnS2 system. When alkali metal atoms are doped in the pure SnS2 system, the band gap of the doped systems increases and the SnS2 system changes from an indirect band gap to a direct band gap. It is found that the density of states in the valence band near the Fermi energy level of all doped systems is primarily contributed by S atoms, and the conduction band is primarily contributed by Sn and S atoms. The ionic bonds are formed between X and S atoms. The polarizability of the doped SnS2 systems is enhanced. Moreover, the absorption and reflection peaks of the SnS2 doping systems are redshifted, which improves the effective utilization rate of the infrared light region.
The effect of micro-gap discharge paths on ionization coefficients and similarity theory
Authors: Zhang Hao , Zhao Laijun , Wang Guoda , Ma Guokai , Sun Yanzhou 
Published: December 2023

Abstract
In order to investigate the impact of discharge paths at the micrometer scale on breakdown, two sets of different electrodes were arranged with electrode gaps ranging from 10 μm to 100 μm and gas pressures varying from 1 kPa to 100 kPa. The research has revealed that without an insulating layer at the edge of the electrode, when the product of gas pressure (p) and electrode gap (d) is less than 60Pa·cm, the number of positive ions cannot satisfy the conditions for self-sustaining discharge at the electrode gap (d). As a result, the discharge path varies along a longer path (s) to satisfy the conditions for self-sustained discharge, thereby maintaining the minimum breakdown voltage. This long-path discharge mechanism affects the ionization coefficient, resulting in an inconsistency between the ionization coefficient ratio at different distances and their respective scale factor (k) values. Therefore, on a micrometer scale, changes in the path make the application of similarity theory no longer applicable.
Design and full analysis of a metafiber-based photothermal bio-probe with perfect conversion efficiency
Authors: Zhu Zebin , Jiang Liyong , Zhao Xiangwei 
Published: December 2023

Abstract
The metafiber, which involves fabricating metasurfaces at optical fiber tips, has shown potential as an integrated optical sensing or photothermal conversion platform. In this study, we present a metafiber-based photothermal bio-probe with a high optical absorption efficiency of 99.83%. Physical mechanisms underlying the efficiency are elucidated using coherent perfect absorption and multiple reflection theories. In our simulation, the probe exhibits ultra-fast heating/cooling rates, high temperature localization, steep temperature gradients, and robust response to environmental factors. In particular, only 1.0 mW of incident power is needed to generate the temperature gradient required for cell capture or drug delivery, while the corresponding temperature near the fiber tip is still safe for biological tissue. These advantages make our designed bio-probe as an ideal platform in various of applications, such as living cells capture, drug delivery, and local hyperthermia.