bluuebunny/crossref_metadata_2025_split huggingface dataset:
DERnet: a deep neural network for end-to-end reconstruction in magnetic particle imaging
Authors: Peng Zhengyao , Yin Lin , Sun Zewen , Liang Qian , Ma Xiaopeng , An Yu , Tian Jie , Du Yang 
Published: December 2023

Abstract

Objective. Magnetic particle imaging (MPI) shows potential for contributing to biomedical research and clinical practice. However, MPI images are effectively affected by noise in the signal as its reconstruction is an ill-posed inverse problem. Thus, effective reconstruction method is required to reduce the impact of the noise while mapping signals to MPI images. Traditional methods rely on the hand-crafted data-consistency (DC) term and regularization term based on spatial priors to achieve noise-reducing and reconstruction. While these methods alleviate the ill-posedness and reduce noise effects, they may be difficult to fully capture spatial features. Approach. In this study, we propose a deep neural network for end-to-end reconstruction (DERnet) in MPI that emulates the DC term and regularization term using the feature mapping subnetwork and post-processing subnetwork, respectively, but in a data-driven manner. By doing so, DERnet can better capture signal and spatial features without relying on hand-crafted priors and strategies, thereby effectively reducing noise interference and achieving superior reconstruction quality. Main results. Our data-driven method outperforms the state-of-the-art algorithms with an improvement of 0.9–8.8 dB in terms of peak signal-to-noise ratio under various noise levels. The result demonstrates the advantages of our approach in suppressing noise interference. Furthermore, DERnet can be employed for measured data reconstruction with improved fidelity and reduced noise. In conclusion, our proposed method offers performance benefits in reducing noise interference and enhancing reconstruction quality by effectively capturing signal and spatial features. Significance. DERnet is a promising candidate method to improve MPI reconstruction performance and facilitate its more in-depth biomedical application.
Emergence of cosmic space in Tsallis modified gravity from equilibrium and non-equilibrium thermodynamic perspective
Authors: Dheepika M , T Hassan Basari V , Mathew Titus K 
Published: December 2023

Abstract
In the context of Tsallis entropy, we explore the connection between the law of emergence and the thermodynamic laws from a more accurate non-equilibrium perspective. Here, the equilibrium Clausius relation does not conform to the standard energy-momentum conservation. Therefore, an effective gravitational coupling is introduced to rewrite the field equation similar to general relativity, and the corresponding generalized continuity equation is obtained. As a result, thermodynamic laws were modified with the non-equilibrium energy dissipation and entropy production terms, using which we derive the law of emergence. The investigation of the law of emergence and the entropy maximization principle with Tsallis entropy in the non-equilibrium perspective shows that both result in the same constraints as obtained in other gravity theories and the equilibrium context of Tsallis entropy, except for an additional constraint on the Tsallis parameter as a result of extra entropy production. Consequently, the thermodynamic interpretation of the expansion of the universe stays valid even with quantum corrections to the horizon entropy since the correction terms in Tsallis entropy can be treated as the quantum corrections to Bekenstein-Hawking entropy.
Phase diagrams of the diode effect in superconducting heterostructures
Authors: Karabassov T , Bobkova I V , Silkin V M , Lvov B G , Golubov A A , Vasenko A S 
Published: December 2023

Abstract
At present the superconducting diode effect (SDE) attracts a lot of attention due to new possibilities in the superconducting electronics. One of the possible realizations of the SDE is the implementation in superconducting hybrid structures. In this case the SDE is achieved by means of the proximity effect. However, the optimal conditions for the SDE quality factor in hybrid devices remain unclear. In this study we consider the Superconductor/Ferromagnet/Topological insulator (S/F/TI) hybrid device and investigate the diode quality factor at different parameters of the hybrid structure. Consequently, we reveal important parameters that have crucial impact on the magnitude of the SDE quality factor.
The distributed order models to characterize the flow and heat transfer of viscoelastic fluid between coaxial cylinders
Authors: Jiang Jinxia 
Published: December 2023

Abstract
The distributed order fractional derivatives can describe complex dynamic systems. In this paper, considering the periodic pressure gradient and magnetic field, the time distributed order fractional governing equations are established to simulate the two-dimensional flow and heat transfer of viscoelastic fluid between coaxial cylinders. Numerical solutions are obtained by the L1 approximation for the Caputo derivative (L1-scheme) and the finite difference method, and the effectiveness of numerical method is verified by a numerical example. Results demonstrate that the time distributed fractional Maxwell model can promote the flow while the distributed Cattaneo model can weaken heat transfer than the fractional Maxwell and Cattaneo model, and different weight coefficients have different effects on the fluid. The effect of physical parameters, such as the relaxation time of velocity and temperature λ
1, λ
2, the magnetic parameter M, the amplitude P
0 and frequency w of pressure gradient, and the Prandtl number Pr on velocity and temperature are discussed and analysed in detail.
Perfect state transfer by means of discrete-time quantum walk on the complete bipartite graph
Authors: Huang Jiani , Li Dan , Li Panlong , Zhou Yuqian , Yang Yuguang 
Published: December 2023

Abstract
Perfect state transfer has attracted a great deal of attention recently due to its crucial role in quantum communication and scalable quantum computation. In this paper, we propose the perfect state transfer algorithms with a pair of sender-receiver and two pairs of sender-receiver on the complete bipartite graph respectively. The algorithm with a pair of sender-receiver is implemented through discrete-time quantum walk, flexibly setting the coin operators based on the positions of the sender and receiver. The algorithm with two pairs of sender-receiver ensures that the two quantum states are distributed on both sides of the complete bipartite graph during the process, thereby achieving perfect state transfer. In addition, the quantum circuits corresponding to the algorithms are provided. The algorithms can transfer an arbitrary quantum state and can simultaneously transfer two arbitrary quantum states from the senders to the receivers in any case. Moreover, the algorithms are not only applicable to complete bipartite graphs but also to more graph structures with complete bipartite subgraphs, which will provide potential applications for quantum information processing.
Study on low-velocity impact response of kevlar/epoxy-polyurethane sandwich panels
Authors: Taghipoor Hossein , Peysayyar Reza 
Published: December 2023

Abstract
This study aims to investigate the maximum energy absorption of sandwich panels featuring composite facesheets and a polyurethane foam core under low-velocity impact. The research explores various impactor head geometries, fiber orientations, and the number of composite layers on the panel facesheets. Three different impactor heads with flat, hemispherical, and conical shapes were used for experimental impacts. Numerical simulations were performed using Abaqus/Explicit finite element software, with damage initiation in the composite layers determined by the three-dimensional Hashin criterion. The results revealed that the conical-head impactor caused the highest energy absorption, accompanied by the greatest displacement and velocity changes. Among specimens with different fiber orientations, the 60° fiber layers exhibited a 9.41% and 8.45% higher maximum force compared to the 30° and 45° fiber layers, respectively. Furthermore, the study investigated the influence of the number of composite layers in the facesheets. It was found that panels with more layers in the bottom facesheet demonstrated a 4.94% increase in energy absorption compared to panels with more layers in the top facesheet. This research provides valuable insights into optimizing sandwich panel designs for enhanced energy absorption during low-velocity impact scenarios.
The Dbar-dressing method for the (2+1)-dimensional Date–Jimbo–Kashiwara–Miwa equation
Authors: Sun Shifei , Li Biao 
Published: December 2023

Abstract
In this work, the (2+1)-dimensional Date–Jimbo–Kashiwara–Miwa (DJKM) equation is studied by means of the

∂

¯

-dressing method. A new

∂

¯

problem has been constructed by analyzing the characteristic function and the Green’s function of its Lax representation. Based on solving the

∂

¯

equation and choosing the proper spectral transformation, the solution of the DJKM equation is constructed. Furthermore, the more general solution of the DJKM equation can be also obtained by ensuring the evolution of the time spectral data.
Time evolutions of scalar field perturbation in Schwarzschild de-Sitter black hole from Einstein-scalar–Gauss–Bonnet theory
Authors: Xu Cheng , Yang Zhen-Hao , Kuang Xiao-Mei , Yue Rui-Hong 
Published: December 2023

Abstract
The scalar-free black hole could be unstable against the scalar field perturbation when it is coupled to a Gauss–Bonnet (GB) invariant in a special form. It is known that the tachyonic instability in this scenario is triggered by the sufficiently strong GB coupling. In this paper, we focus on the time domain analysis of massive scalar field perturbation around the Schwarzschild de-Sitter black hole in Einstein-scalar–Gauss–Bonnet gravity. By analyzing the scalar field propagation, we find that the scalar field will finally grow when the GB coupling is large enough. This could lead to the instability of the background black hole. Furthermore, we demonstrate how the mass of the scalar field and the GB coupling strength affect the onset of tachyonic instability.
Soliton resolution and asymptotic stability of N-solutions for the defocusing Kundu–Eckhaus equation with nonzero boundary conditions
Authors: Fan Engui , Zhang Yanxi 
Published: December 2023

Abstract
In this paper, we address interesting soliton resolution, asymptotic stability of N-soliton solutions and the Painlevé asymptotics for the Kundu-Eckhaus (KE) equation with nonzero boundary conditions

i

q

t

+

q

xx

−
2
(
∣
q

∣

2

−
1
)
q
+
4

β

2

(
∣
q

∣

4

−
1
)
q

+

4
i
β

∣
q

∣

2

x

q
=
0
,

q
(
x
,
0
)
=

q

0

(
x
)
∼
±
1
,

x
→
±
∞
.

The key to proving these results is to establish the formulation of a Riemann-Hilbert (RH) problem associated with the above Cauchy problem and find its connection with the RH problem of the defocusing NLS equation. With the

∂

¯

-steepest descent method and the results of the defocusing NLS equation, we find complete leading order approximation formulas for the defocusing KE equation on the whole (x,t) half-plane including soliton resolution and asymptotic stability of N-soliton solutions in a solitonic region, Zakharov-Shabat asymptotics in a solitonless region and the Painlevé asymptotics in two transition regions.
Random-search efficiency in a bounded interval with spatially heterogeneous diffusion coefficient
Authors: Menon Jr L , dos Santos M A F , Anteneodo C 
Published: December 2023

Abstract
We consider random walkers searching for a target in a bounded 1D heterogeneous environment, in the interval

[
0
,
L
]

, where diffusion is described by a space-dependent diffusion coefficient D(x). Boundary conditions are absorbing at the position of the target (set at x = 0) and reflecting at the border x = L. We calculate and compare the estimates of efficiency

ε
1

=
⟨
1

/

t
⟩

and

ε
2

=
1

/

⟨
t
⟩

. In the Stratonovich framework of the multiplicative random process, both measures are analytically calculated for arbitrary D(x). For other interpretations of the stochastic integrals (e.g. Itô and anti-Itô), we obtain general results for ɛ
2, while ɛ
1 is obtained for particular forms of D(x). The impact of the diffusivity profile on these measures of efficiency is discussed. Symmetries and peculiar properties arise when the search starts at the border (

x
0

=
L

). In particular, heterogeneity spoils the efficiency of the search within the Stratonovich framework, while for other interpretations the searcher can perform better for certain heterogeneous diffusivity profiles.
Solar insolation and PV module temperature impact on the actual grid connected solar photovoltaic system in German Malaysian Institute
Authors: Mustafa R , Radzi M A Mohd , Hizam H , Soh A Che 
Published: December 2023

Abstract
German Malaysian Institute (GMi) has a great potential for utilising solar photovoltaic (PV) electricity. In this study, the performance of a 3kW grid-connected solar PV (GCSPV) system is monitored using Sunny Portal web in conjunction with Sunny SensorBox. The daily solar energy that strikes a PV array cannot be totally transformed into grid-compatible electricity. As a result of power losses, the production of solar PV systems falls short of expectations. The primary objective of this study is to examine the influence of solar insolation and PV module temperature on the actual output of the GCSPV system compared to the predicted output system by considering elements that affect the conversion of solar power to electrical power in GCSPV systems. The study prediction method based on calculations was carried out. Prediction of output system considered all losses, including efficiency of PV module, solar insolation, temperature of PV module, dirt, manufacturer’s tolerance and module mismatch, the voltage drop in DC cables to inverter, and inverter efficiency. The data indicate that the average power generation is 7.26% lower than predicted by the system. The GCSPV system’s performance efficiency is diminished by the temperature increase and somewhat enhanced by an increase in solar insolation. Temperature has a crucial impact in the energy conversion process of PV module. The effectiveness of the PV module in generating energy and power is dependent on its operating temperature.
Initial Design of Free energy magnetic generator (FEMG)
Authors: Mostaman Nur Afiqah , Sulaiman Erwan , Jenal Mahyuzie , Somroo Irfan Ali 
Published: December 2023

Abstract
Nowadays, it is essential for some areas that there would be implemented such ways for electricity cost reductions in the areas, equipment durability and minimal technical labour demand maintenance. There are many type of generator that can help to generate the electricity such as steam turbines, gasoline turbines, electrical generators, solar or wind turbines, internal combustion engines, and biogas engines. However, there are many drawbacks of using these generators. One of the major drawbacks of these non-renewable generators are the released of hazardous exhausts into the environment such as carbon dioxide, nitrogen oxide, or any other dangerous exhaust. These will produce air pollution, although it imposes environmental costs through manufacture and construction. One of the well-known energy sufficient generator is the permanent magnet generator. The main aim for this project is to design a Free Energy Magnetic Generator (FEMG) using conventional induced voltage generating principle for industrial and residential appliances. The design will be used JMAG Designer Software from designing and observing the generator. It can be concluded that this generator can give a continuous output power supply due to the capability of the generator to produce high output power with low cogging torque which is 2.1Nm. Perhaps, the maximum value of magnetic flux between coil is 2.1066 while the minimum value is 0.0418.
Economic analysis of phase change material integrated photovoltaic thermal systems: A short communication
Authors: Jacob Jeeja , Paul John , Selvaraj Jeyraj , Kadirgama K 
Published: December 2023

Abstract
Solar energy is the most prospective renewable resource that humankind has access to, for acquiring the most usable energy. Photovoltaic thermal systems (PVT) are deemed to be one among the most efficient methods for capturing solar energy because of their distinct ability to produce electrical power by photovoltaic conversion while simultaneously dissipating the heat generated in the process. The necessity of financial investment is a major stumbling block in putting this strategy into action in actual application. This paper delivers updated literature on the economic aspects of PVT-Phase change materials (PCM) systems (installation, operation, and maintenance) that several researchers had carried out. Payback time is taken into account while calculating the profitability of PVT systems. Finally, the performances of several PVT-PCM systems were compared, and the economic analysis confirmed that the PVT system is financially viable. PVT system holds tremendous potential to be incorporated in residential/commercial buildings. The PVT system is a promising technology that still needs refinement in terms of overall efficiency and environmental factors, according to the available literature assessments.
Performance analysis of sandwich switched flux switching permanent magnet motor using modular rotor
Authors: Soomro Irfan Ali , Sulaiman Erwan Bin , Jenal Mahyuzie Bin , Ahmad MD Zarafi Bin 
Published: December 2023

Abstract
Conventional flux-switching permanent magnet brushless machines (PMFSM) gained a lot of attraction due to their high torque densities, simple and robust rotor structure, and the permanent magnets and coils on the stator. The sandwich PMFSM machine has been proposed to improve the torque density of the machine in which two PM pieces are sandwiched in one stator pole to enhance the PMs usage efficiency. 2D finite element analysis (2DFEA) method is employed to compare the performance of sandwich PMFSM with salient rotor topology with that of sandwich PMFSM with modular rotor, in terms of flux linkage, flux distribution, flux strengthening, induced back EMF, cogging torque and average torque. From the results it is shown that the salient sandwich PMFSM and sandwich PMFSM modular rotor produces 9.28Nm and 6.7Nm, respectively.
Evaluation of generation cost-based feed-in tariff rate for wind energy in Myanmar
Authors: Min Y , Selvaraj J , Soe T T 
Published: December 2023

Abstract
Feed-in Tariff (FiT) policy is proven to be an effective mechanism for enabling and accelerating the growth of wind energy industry. The determination of remuneration level in designing FiT system is a critical component that governs the extent of success for adoption of the policy. This study conducts a generation cost-based approach, applying the Net Present Value method, to determine the baseline FiT rate for the case of onshore wind energy in Myanmar. The analysis result indicates that USD 0.1453/kWh is required as a baseline rate to attract the energy producers for investing in Myanmar wind energy sector at the weighted average cost of capital of 11.25%, with debt-to-equity ratio of 70%. The sensitivity analysis is carried out to minimize the uncertainties associated with parameterization. It is found that baseline FiT rate is very sensitive to initial investment cost, and capacity factor whereas it is less sensitive to operation and maintenance cost. It is also found that lower cost of debts and higher debt-to-equity ratios could result in lower FiT values.
Low Harmonics Plug-in Home Charging Electric Vehicle Battery Charger Simulation Model of Zero Crossing
Authors: Arof Saharul , Mawby Philip , Arof Hamzah , Noorsal Emilia 
Published: December 2023

Abstract
Harmonic currents are high in conventional rectifiers. The previous work proposed a new battery charger circuit to reduce harmonics effect and improve total harmonic distortion (THD). The design and development of a home charging electric vehicle battery charger circuit should anticipate potential issues. For this reason, the proposed battery charger, buck chopper, and zero cross circuits must be simulated before real hardware implementation. Simulation and simulation models are needed to describe system behaviour because experimentation might be dangerous, expensive, and time-consuming. This paper describes a simulation model of a zero-crossing circuit and its control algorithm, that provide control signals to a five-level single phase Multi Level Rectifier (MLR)) to draw the MLR for a clean sinusoidal line current with low harmonics. The proposed circuit and the algorithms perform as expected when tested using MATLAB/Simulink and PROTEUS software.
Techno-economic evaluation of CO2 utilization from gas processing facility to blue methanol using green hydrogen
Authors: Martanto Tri , Nizami Muhammad , Purwanto Widodo Wahyu 
Published: December 2023

Abstract
The CO2 waste gas from the gas industry contributes to global warming hence it needs to be reduced or further processed. One of the pathways to utilize CO2 produced from the gas industry is used as a raw material for manufacturing chemicals. This study aims to evaluate techno-economic of CO2 hydrogenation to blue methanol. CO2 sources originated from gas fields located in Central Sulawesi and Central Java and hydrogen from PV electrolysis. The process system was simulated using Aspen HYSYS V.12. The technical analysis was performed using CO2 mass consumption, CO2 conversion, and PV area requirement. The economic analysis was performed using a levelized cost of process. The result shows that CO2 mass consumption for gas fields in Central Sulawesi and Central Java were 1.45 and 1.42 ton-CO2/ton-MeOH, respectively. The CO2 conversion was 94.8% and 96.0% for Central Sulawesi and Central Java, respectively. To produce 1-ton of methanol required PV area of 38,146 m2 in Central Sulawesi and 34,965 m2 in Central Java with methanol production cost in Central Sulawesi and Central Java were 1,960.87 and 1,196.21 $/ton-MeOH, respectively.
WITHDRAWN: Electrical impedance tomography: a review on hardware systems and circuits
Authors: Li Wensheng , Shi Hong , Zhang Luping , Zhang Xinyi , Zhang Fu , Yang Yuxiang 
Published: December 2023

Withdrawal
This article has been withdrawn by IOP Publishing due to the work containing multiple figures that were reproduced from other sources without any evidence of permission having been obtained. The authors have not provided proof of permissions, therefore IOP Publishing has made the decision to withdraw the work.
Development of a toroidal soft x-ray imaging system and application for investigating three-dimensional plasma on J-TEXT
Authors: ZHAO 赵 Chuanxu 传旭 , LI 李 Jianchao 建超 , ZHANG 张 Xiaoqing 晓卿 , WANG 王 Nengchao 能超 , DING 丁 Yonghua 永华 , YANG 杨 Zhoujun 州军 , JIANG 江 Zhonghe 中和 , YAN 严 Wei 伟 , LI 李 Yangbo 杨波 , MAO 毛 Feiyue 飞越 , REN 任 Zhengkang 正康 , Team the J-TEXT 
Published: December 2023

Abstract
A toroidal soft x-ray imaging (T-SXRI) system has been developed to investigate three-dimensional (3D) plasma physics on J-TEXT. This T-SXRI system consists of three sets of SXR arrays. Two sets are newly developed and located on the vacuum chamber wall at toroidal positions

of

° and

°, respectively, while one set was established previously at

°. Each set of SXR arrays consists of three arrays viewing the plasma poloidally, and hence can be used separately to obtain SXR images via the tomographic method. The sawtooth precursor oscillations are measured by T-SXRI, and the corresponding images of perturbative SXR signals are successfully reconstructed at these three toroidal positions, hence providing measurement of the 3D structure of precursor oscillations. The observed 3D structure is consistent with the helical structure of the m/n = 1/1 mode. The experimental observation confirms that the T-SXRI system is able to observe 3D structures in the J-TEXT plasma.