bluuebunny/crossref_metadata_2025_split huggingface dataset:
Corrigendum: Thermodynamic parameters of atomically thin superconductors derived from the upper critical field (2022 Supercond. Sci. Technol.
35
084007)
Authors: Talantsev Evgeny F 
Published: August 2022

Abstract
Equations (35)–(37) in original article (2022 Supercond. Sci. Technol.
35 084007) were inadvertently written with misprints. Correct versions of these equations are given in this Corrigendum. I confirm that misprints are restricted to the printing versions of these equations in the original article, and data analysis reported in the article was performed by the use of correct versions of these equations.
Nonlinear dynamics of the dissipative anisotropic two-photon Dicke model
Authors: Li Jiahui , Fazio Rosario , Chesi Stefano 
Published: August 2022

Abstract
We study the semiclassical limit of the anisotropic two-photon Dicke model with a dissipative bosonic field and describe its rich nonlinear dynamics. Besides normal and ‘superradiant’-like phases, the presence of localized fixed points reflects the spectral collapse of the closed-system Hamiltonian. Through Hopf bifurcations of superradiant and normal fixed points, limit cycles are formed in certain regions of parameters. We also identify a pole-flip transition induced by anisotropy and a region of chaotic dynamics, which appears from a cascade of period-doubling bifurcations. In the chaotic region, collision and fragmentation of symmetric attractors take place. Throughout the phase diagram we find several examples of phase coexistence, leading to the segmentation of phase space into distinct basins of attraction.
Broadband acoustic double-zero-index cloaking with coupled Helmholtz resonators
Authors: Wang WenQin , Fang XinSheng , Wang NengYin , Li Yong , Hao Tong 
Published: August 2022

Abstract
Acoustic double-zero-index metamaterials (DZIM) characterized by extremely large phase velocity along with no phase changes of the wave propagation inside the materials have received tremendous attention due to the fascinating physics and potential applications. However, due to the requirement of the degeneracy of dipolar and monopolar resonances and the available resonance-induced losses, the realization of highly efficient and broadband near-zero index metamaterials is still facing challenges. Here we report that by coupling two identical Helmholtz resonators with a connecting channel, acoustic DZIM can be realized. Owing to the presence of a connecting tube, the system can generate the dipolar mode that is independently tunable and the monopolar mode that is virtually unchanged. It thereby makes the mass density (ρ) and the reciprocal of the bulk modulus (1/B) simultaneously crossing zero possible. We numerically obtain the transmission and phase, and then calculate the effective mass density and bulk modulus, which agree remarkably well with the experimental results. Finally, we successfully cloak a rectangle block inside a two-dimensional waveguide grafted by the designed acoustic DZIM array of unit cells. A broadband cloaking is experimentally demonstrated at 1865–1925 Hz, which can offer potential possibilities for vast practical applications.
Autonomous jerk oscillator with sine nonlinearity and logistic map for sEMG encryption
Authors: Ramakrishnan Balamurali , Welba Colince , Chamgoué André Cheage , Karthikeyan Anitha , Kingni Sifeu Takougang 
Published: August 2022

Abstract
This research discusses the dynamical behaviors of the autonomous jerk oscillator with sine nonlinearity (AJOSN) and its application to secure s-EMG (Surface ElectroMyoGraphic) data. The AJOSN has two or no-equilibrium points, and the stability of the two equilibrium points indicates that one is stable and the other is unstable. The AJOSN reveals fast-spiking and periodic bursting, relaxing and periodic oscillations, hidden chaotic attractors and coexisting attractors. The numerical analysis results are validated by the Field Programmable Gate Array (FPGA) implementation. Finally, the AJOSN’s chaotic behavior coupled with the logistic map is exploited to encrypt the s-EMG signals. The proposed encryption and decryption method consists of simultaneously encrypting the sEMG signal. The sEMG signal, once transformed into 2D as a grayscale image, undergoes first encryption based on the chaotic signal generated by the AJOSN (Autonomous jerk oscillator with sine nonlinearity) model. The encrypted signal obtained from this first part is called ‘Jerk encrypted signal.’ The second part is to encrypt the ‘Jerk Encrypted Signal’ by the chaotic logistics map. The encryption and decryption results obtained are quite encouraging and offer a great prospect.
Nonreciprocal transmission in a four-mode cavity magnonics system
Authors: Li Xiaoxia , Li Jingyan , Cheng Xuxin , Li Guang-an 
Published: August 2022

Abstract
We propose a scheme to create optical nonreciprocal transmission in a double-cavity magnonics system, where one yttrium iron garnet sphere is placed in one of the cavities and a mechanical oscillator is shared by the coupled double microwave cavities. By manipulating the magnon–microwave photon coupling, we reveal the nonreciprocal propagation of electromagnetic fields at microwave frequencies in red and blue-detuned regimes. Furthermore, the nonreciprocal isolation ratio and group delay are analyzed. This scheme can inspire methods for constructing nonreciprocal devices.
Argon doped pellets for fast and efficient radiative power removal in ASDEX Upgrade
Authors: Kallenbach A. , Lang P.T. , Bernert M. , Dux R. , Eberl T. , Gleiter T. , McDermott R.M. , Piccinni C. , Ploeckl B. , Rohde V. , Zito A. 
Published: August 2022

Abstract
Argon doped deuterium pellets with about 1 per mille Ar atomic fraction have been injected into ASDEX Upgrade H-mode discharges and demonstrate fast and efficient power removal from the outer plasma region. Bolometer views directly on the pellet and in its very close vicinity observe a strong, non-toroidally symmetric radiation pattern on a fast, sub-ms time scale. This pattern is explained by the ionisation process of the delivered Ar neutrals, leading to non-coronal radiation by intermediate ionisation stages until the equilibrium He like stage is reached. Subsequently, a toroidally symmetric radiation increase is observed with a fast initial decay time of about 20 ms consistent with the radial particle transport time scale for a source located in the outer plasma. In the following, a radiation pattern related to Ar recycling develops comparable to the pattern observed with Ar midplane gas puffing which decays with the Ar divertor pumping time of about 200 ms. The energy radiated around each pellet is described by the radiative potential of Ar evaluated for non-coronal conditions with the ablation time as the relevant time scale. A factor 4 too low radiated energy is obtained by this simple model, which could be explained by stronger deviations from corona equilibrium and plasma parameter variations in the vicinity of the pellet. Injection of Ar-doped pellets into a no-ELM quasi-continuous exhaust H-mode discharge showed no triggering of ELMs by the pellet. Advantages of the pellet seeding scheme are the faster reaction time of the radiation compared to gas puffing, which may be important to counter-act transient re-attachment in ITER or in a reactor and an elevated radiative efficiency in the outer core plasma due to non-corona effects.
A tungsten deep neural-network potential for simulating mechanical property degradation under fusion service environment
Authors: Wang Xiaoyang , Wang Yinan , Zhang Linfeng , Dai Fuzhi , Wang Han 
Published: August 2022

Abstract
Tungsten is a promising candidate material in fusion energy facilities. Molecular dynamics (MD) simulations reveal the atomistic scale mechanisms, so they are crucial for the understanding of the macroscopic property deterioration of tungsten under harsh and complex service environments. The interatomic potential used in the MD simulations is required to accurately describe a wide spectrum of relevant defect properties, which is by far challenging to the existing interatomic potentials. In this paper, we propose a new three-body embedding descriptor and hybridize it into the deep-potential (DP) framework, an end-to-end deep learning interatomic potential model. The potential model for tungsten, named DP-HYB, is trained with a database constructed by the concurrent learning method. The DP-HYB model is able to accurately predict elastic constants, stacking fault energy, the formation energies of free surfaces, and point defects, which are considered in the training dataset. It also accurately evaluates the formation energies of grain boundaries and prismatic loops, the core structure of screw dislocation, the Peierls barrier, and the transition path of the screw dislocation migration, which do not explicitly present in the training dataset. The DP-HYB is a good candidate for the atomistic simulations of tungsten property deterioration, especially those involving the mechanical property degradation under the harsh fusion service environment.
Critical behaviour of the quasi-periodic quantum Ising chain
Authors: Crowley P J D , Laumann C R , Chandran A 
Published: August 2022

Abstract
The interplay of correlated spatial modulation and symmetry breaking leads to quantum critical phenomena intermediate between those of the clean and randomly disordered cases. By performing a detailed analytic and numerical case study of the quasi-periodically (QP) modulated transverse field Ising chain, we provide evidence for the conjectures of reference (Crowley et al 2018 Phys. Rev. Lett.
120 175702) regarding the QP-Ising universality class. In the generic case, we confirm that the logarithmic wandering coefficient w governs both the macroscopic critical exponents and the energy-dependent localisation length of the critical excitations. However, for special values of the phase difference Δ between the exchange and transverse field couplings, the QP-Ising transition has different properties. For Δ = 0, a generalised Aubry–André duality prevents the finite energy excitations from localising despite the presence of logarithmic wandering. For Δ such that the fields and couplings are related by a lattice shift, the wandering coefficient w vanishes. Nonetheless, the presence of small couplings leads to non-trivial exponents and localised excitations. Our results add to the rich menagerie of quantum Ising transitions in the presence of spatial modulation.
The stabilization of random Boolean networks through edge immunization
Authors: Wang Jiannan , Wei Wei , Gao Qing , Zheng Zhiming 
Published: August 2022

Abstract
The stability of random Boolean networks (RBNs) has aroused continuous interest due to its close relationship with genetic regulatory systems. In this paper, we aim to stabilize RBNs through immunization of a minimum set of influential edges. By formulizing network stability with edge-based Hamming distance, we exploit the cavity method with the assumption of locally tree-like topology and find that the stability of RBNs is determined by the largest eigenvalue of weighted non-backtracking matrix. Combined with the collective influence theory in optimal percolation research, we quantify the contribution of each edge to the largest eigenvalue and propose an efficient edge immunization strategy. As validation we perform numerical simulations on both synthetic and real-world networks. Results show that the proposed strategy outperforms the other benchmarks and achieves stabilization with fewer immune edges. In addition, we also find that the top influential edges are rarely the most connected, which emphasizes the significance of global network topology rather than local connections. Our work sheds light on the stabilization of RBNs, and moreover, provides necessary theoretical guidance to the targeted therapy of genetic diseases.
Sine Cosine Algorithm for Tuning Cascaded PI Controllers for PMSM Drive System Speed Control
Authors: Naser Doaa Salih , Abed Issa Ahmed , Al-Thammer Diyah 
Published: August 2022

Abstract
This paper presents the new metaheuristic which termed as the Sine-Cosine Algorithm (SCA) to tune the parameters of three Proportional Integrals that are optimum (PI) controllers to track the speed desired of Permanent Magnet Synchronous Motor (PMSM). The Integral Time Square Error (ITSE) is utilized as an objective function. The suggested PI controllers tuned by the algorithm are used to obtain the best PI values. Finally, the simulation findings reveal that the suggested objective fitness with this algorithm is more successful than the classical approach for tuning PI values in terms of high-speed tracking and less ripple.
Energy Efficient Ant Colony System for Packet Routing in Wireless Sensor Network
Authors: Nasir Husna Jamal Abdul , Ku-Mahamud Ku Ruhana , Kamioka Eiji 
Published: August 2022

Abstract
Routing packets in Wireless Sensor Network (WSN) is challenging due to the distribution of sensor nodes with different ability. Inefficient routing may lead to higher failure rate, higher latency and higher energy consumption. One of the common approaches to solve this problem is by using bio-inspired routing algorithms due to their abilities to adapt with dynamic environment. This paper proposed an improved ant colony system for packing routing in WSN that focuses on exploration and exploitation techniques. In the proposed routing algorithm, the best path to be used for packet transmission will be determined by considering the remaining energy of each sensor node to reduce the hotspot problem. Local pheromone update and global pheromone update are used with the aim to prevent imbalanced energy depletion of sensor nodes and to balance the packet distribution. The proposed routing algorithm was validated against several bio-inspired routing algorithms in medium and large sized networks. The results suggested that it has outperformed in terms of success rate, packet loss rate, latency and energy efficiency.
Double-layer Remote Configuration with LaOF: Eu3+ and Sr3WO6:U Phosphors: A Selection for Enhancing The Optical Efficiency of WLEDs
Authors: Hung Khanh Nguyen , Le Phan Xuan , Lee Hsiao-Yi 
Published: August 2022

Abstract
Although the distant phosphor configuration is a good selection for high-luminescence WLEDs, it did not satisfy the high color adequacy standard. With the aim of achieving improved chromatic indices, including the index for color rendering (CRI) and the scale of color quality (CQS), for the distant phosphor structure, a dual-layer design with red or green phosphor addition is suggested in this research report. The color temperature of the WLEDs packets employed in this investigation is 8500 K. The phosphor configuration will be produced by layering green Sr3WO6:U or red LaOF:Eu3+ phosphor on top of the yellow phosphor YAG:Ce3+. The concentration of additional red phosphor LaOF:Eu3+ and green phosphor Sr3WO6:U will then be adjusted to observe the changes in color in luminescence performance of the WLED packages. The theory of Mie about scattering combined with Lambert Beer’s rule supports the investigation on optical results. The findings demonstrated a rise in CRI and CQS along with the existence of LaOF:Eu3+, indicating that the LaOF:Eu3+ presence has a major impact on these two elements. Because of the increased concentration of red light components within WLED packets, CRI and CQS increase with increasing concentration of LaOF:Eu3+. In the meantime, the green phosphor Sr3WO6:U improves the beams of light. However, if the concentrations of both the red LaOF:Eu3+ and the green Sr3WO6:U phosphors are above the corresponding level, the beams of light and color intensity will be reduced. The outcomes of this study are crucial references for producing WLEDs with greater light of white standard.
Design and characterization of Screen-Printed Piezoresistive Cantilever for Gas Sensor Application
Authors: Saleh Naouras , Jamel Nursabirah , Nawi Illani Mohd 
Published: August 2022

Abstract
In this paper, the design, and the characterization of screen-printed cantilever-based humidity sensor are described. The project investigated in detail the sensitivity, and fabrication process of screen-printing based sensor with coated active humidity material on cantilever’s free end. The main aim of this paper is to compare the screen-printed technology with other existing technologies like micro-electro-mechanical system (MEMS), and low temperature cofired circuit (LTCC). The sensor has been simulated under different level of relative humidity with two different temperature value: 35°C, and 45°C. This paper also represents an analytical and mathematical modeling approach for frequency shift and thick film resistance change of the selected sensor. The analytical results are compared with the simulated results.
Scintillation Effects of Ka-band Frequency on Satellite Application
Authors: Badron Khairayu , Mujei Aida Syafiqah , Rahim Nadirah Abdul , Ismail Ahmad Fadzil , Ahmad Yasser Asrul 
Published: August 2022

Abstract
The satellite communication system is currently congested because of the high demand for data transmission. The Ka-band is a greater range band that can help to solve the issue. However, Ka-band is severely impacted by scintillation at its high frequency. One of the transmitting impairments is scintillation, a sudden fluctuation in the amplitude of the signal and electromagnetic waves, that generates signal attenuation and degradation. In the presence of rain and even under clear skies, scintillation affects the output of Ka-Band. The scintillation prediction model has mostly been evaluated and applied in countries with four-season climates. The objective of this study was to evaluate the Ka-band scintillation data and compare the findings with other existing scintillation models to validate the outcome. For data of one year (2016) at the Ka-Band frequency of 20.2 GHz, this research focused on analysing the tropospheric scintillation from the satellite data. The experimental data from MEASAT 5 were analysed to see the effect of tropospheric scintillation under clear-sky conditions using a dish antenna with a diameter of 7.3 metres and an elevation angle of 68.8°. The satellite signal measurement samples were gathered and filtered using MATLAB to provide clear-sky scintillation. Next, the obtained raw data was converted into readable data. The data was then plotted, and the experimental data was compared to the other models of scintillation. It was essential to evaluate the outcome of the comparison and address which model was most appropriate for tropical climates. Moreover, this project’s cutoff frequency was 0.023Hz, which was computed from the average cut-off frequencies of 12 months in 2016.
Numerical Investigation on Heat Sink Material for Temperature Control of Electronics
Authors: Durgam Shankar , Ghodake Bharati , Mohite Suhas 
Published: August 2022

Abstract
This article reports a numerical investigation on advanced heat sink material for thermal management of electronics. We investigated heat transfer enhancement using different heat sink materials. The cooling medium used for analysis is water. Forced water convection in copper alloy and aluminum alloy Al6060, Al6063 material micro-channel heat sinks cooling was studied numerically using Ansys Fluent. The heat sink is an essential element in a PC. The total efficiency, price, and size of the electronic device depend on the heat sink material. The heat transfer rate is a direct function of heat sink material. The simulation used three different velocities, 3, 5, and 7 m/s; the constant heat flux value taken is 8 × 105 W/m2. The parameters considered for heat sink material are thermal conductivity, thermal expansion coefficient, density, and cost. The ceramic materials have a low thermal expansion coefficient and higher thermal conductivity hence used as a substrate. Results show that aluminum alloys are suitable materials for heat sinks because of their cost, weight, and ease of machinability.
Damage Prediction of Pre-cracked High-Pressure Pipelines
Authors: Kundu B , Ghosh S , Ghosh D , Saha K , Chatterjee I , Ghosh S 
Published: August 2022

Abstract
Due to the increasing need to transport fluids, the use of industrial pipes and their sustainability is a crucial aspect to address. The motive of this work is to predict the behaviour of a pre-cracked pipeline under internal and external pressure using Finite element simulation. An intermediate range of pressure conditions has been selected to analyse the dispersal of normalized stress intensity factor along a semi elliptical crack front for a predefined crack geometry. This work also presents a comparative study of various piping material behaviour to address a relatively better choice for industrial use. Among the various alloys considered in the analysis Inconel 625 was found to be most appropriate for the pressure range.
Channels Selection for Pattern Recognition of Five Fingers Motor Imagery Electroencephalography Signals
Authors: Azizah R N , Zakaria H , Hermanto B R 
Published: August 2022

Abstract
Research about pattern recognition on electroencephalography (EEG) signal of finger motor imagery (MI) plays a critical role in Brain-Computer Interfaces (BCI) based hand prosthetics development. However, the previous research still used irrelevant channels to finger MI. This work proposed optimal EEG channels combination for five-finger MI. It is achieved by subject-dependence channel selection using One versus Rest Common Spatial Pattern (CSP-OVR) combined with sequential searching algorithms due to specific neural activation areas of MI. Optimal channels combinations are of great importance to reduce channels number. It supports the development of practical BCI-based hand prosthetics that can help hand handicapped to do daily activities easier. Experimental results show 4 out of 19 channels are relevant to five-finger MI with 0,6% accuracy degradation compared with EEG-MI pattern recognition using 19 channels. This result is better than the Principal Component Analysis (PCA) channel selection method that only selects 11 out of 19 channels with 1 % accuracy degradation.
A Preliminary Analysis on RF Antenna Simulation comparison based on UHF and 5G for Energy Harvest Application
Authors: Affendi N. A. M. , Nasir N.N. , Ismail S.S. 
Published: August 2022

Abstract
The goal of this research is to look at the performance of RF antennas in the UHF and 5G frequencies for energy harvesting applications. Energy harvesting is the method of gathering and storing external sources in a wireless autonomous device. The focus of this simulation is on two design parameters for a meander dipole antenna that can be utilised for energy harvesting in the UHF and 5G bands. The antenna design is based on FR4 material with a dielectric constant of 4.4 and thicknesses of 3.5 mm and 1.15 mm for the initial simulation. As a result, the CST Studio Suite Software was used to model the meander dipole type. To test performance, S11 passes below -25.79 dB for UHF and -25.7idB for 5G ranges are typically utilised. At these frequencies, the antenna bandwidths are 44.5 MHz and 450 MHz, respectively Finally, the developed Meander dipole antenna can be employed in RF energy harvesting applications, such as wireless sensor networks, by combining rectifier and matching circuits.