bluuebunny/crossref_metadata_2025_split huggingface dataset:
The enhancement of the optical properties of CdS/PMMA by adding fullerence C60
Authors: Maged Fatma Abdel , Mansour A F 
Published: May 2022

Abstract
The C60/CdS//PMMA nanocomposites were synthesized via the casting method. Prepared samples were analyzed by XRD, SEM, TEM, and FTIR analysis. UV–visible spectroscopy was used to evaluate optical properties of CdS//PMMA& C60/CdS//PMMA nanocomposite. The Eg decreased from 2.65 eV to 2 eV with the increment CdS content. The C60 nanoparticles have a significant influence, The absorption of C60 CdS/PMMA nanocomposite is enhanced compared to CdS/PMMA Fullerene is an effective strategy for improving CdS photocatalytic performance. This enhancement is due to the electronic transition of π to π* for C60 and n to π* between the n orbit of the CdS and C60. Degradation efficiency is 17% for CdS/PMMA, and 33% for C60/CdS/PMMA nanocomposite. Thus C60/CdS/PMMA can be used for optoelectronic devices, solar cell applications and photocatalytic activity.
Anomalous transport for multispecies reactive system with first order decay: time-fractional model
Authors: Chaudhary Manish , Singh Mritunjay Kumar 
Published: May 2022

Abstract
The prediction of pollutant migration and its concentration variation in the subsurface hydrology is vitally requisite for the assessment and restorative treatment of polluted groundwater system. Pollutant migration for the multispecies reactive system cannot be reliably investigated by classical form of convection-dispersion equation (CDE), due to the presence of more than one reactive species. This paper establishes a time-fractional model for multispecies reactive system under the first order sequential reaction network to understand the anomalous or non-Fickian migration phenomenon for reactive pollutants. At present, most of the fractional models are presented for the classical CDE to investigate migration phenomenon for single species system, not for the multispecies reactive system due to the complexity of the modelled framework. The impact of fractional derivative model is analysed for variable dependent migration parameters and constant parameters, both for the multispecies reactive migration phenomenon. The fractional derivative is expressed in the Caputo sense and to handle the non-linearity of problem, Homotopy perturbation method (HPM) is adopted. The advantage of this method, to get the solutions, is that the HPM is independent of small parameters required for the deformation process as used in other existing perturbation techniques, which make it much more convenient to use for non-linear systems. The impact of the fractional derivative index and other migration parameters is graphically depicted for the reactive species and significant influence of fractional term is observed. The derived solutions are then validated by using the corresponding solutions obtained by other existing well-established methods to ensure the convergence of the HPM solutions. As there do not exist any solutions for such fractional models for multispecies reactive system, this study may be advantageous to convey better understanding for the anomalous or non-Fickian migration for reactive pollutants and their remediation planning in the groundwater resources.
Study of electronic and optical response of Zn-CeO2 using first principle and experimental investigations
Authors: Aslam Shamim , Amiza Ms , Siddig Abubaker , Al Zayed Nasser Saleh , Ramay Shahid M , Saleem Murtaza 
Published: May 2022

Abstract
Ceria (CeO2) is an important material mainly for microelectronic and fuel-cell applications due to having high dielectric constant and good catalytic properties. The first principle and experimental investigations were carried out to study the effect of Zn incorporation on the electronic and optical response of CeO2. Density of states spectra depict the prominent hybridization of Ce–f and O–p states while band structure reveals the decrease in bandgap with the incorporation of metallic Zn content in ceria structure. X-ray diffraction analysis detects the crystalline traces of CeO2 in pristine and doped thin films. Field emission scanning electron micrographs and energy dispersive x-ray spectra of synthesized thin films present the uniform distribution of grains with clear grain boundaries with expected elemental contents. The experimental observations comparatively follow the trend of simulation curves. Optical studies demonstrate a clear increment in absorption coefficient, optical conductivity, and real epsilon with Zn incorporation in ceria which makes these compositions favorable for applications in modern electronic devices.
Final bound-state formation effect on dark matter annihilation *
Authors: Wang Xinyu , Zhong Fucheng , Luo Feng 
Published: May 2022

Abstract
If two annihilation products of dark matter (DM) particles are non-relativistic and couple to a light force mediator, their plane wave functions are modified due to multiple exchanges of the force mediator. This gives rise to the final state Sommerfeld (FSS) effect. It is also possible that the final state particles form a bound state. Both the FSS effect and final bound-state (FBS) effect need to be considered in the calculation of the DM relic abundance. The annihilation products can be non-relativistic if their masses are comparable to those of the annihilating DM particles. We study the FSS and FBS effects in the mass-degenerate region using two specific models. Both models serve to illustrate different partial-wave contributions in the calculations of the FSS and FBS effects. We find that the FBS effect can be comparable to the FSS effect when the annihilation products couple strongly with a light force mediator. Those effects significantly modify the DM relic abundance.
First operations with caesium of the negative ion source SPIDER
Authors: Sartori E. , Agostini M. , Barbisan M. , Bigi M. , Boldrin M. , Brombin M. , Casagrande R. , Dal Bello S. , Dan M. , Duteil B.P. , Fadone M. , Grando L. , Maistrello A. , Pavei M. , Pimazzoni A. , Poggi C. , Rizzolo A. , Shepherd A. , Ugoletti M. , Veltri P. , Zaniol B. , Agnello R. , Agostinetti P. , Antoni V. , Aprile D. , Candeloro V. , Cavallini C. , Cavazzana R. , Cavenago M. , Chitarin G. , Cristofaro S. , Dalla Palma M. , Delogu R. , De Muri M. , Denizeau S. , Fellin F. , Ferro A. , Gasparrini C. , Jain P. , Luchetta A. , Manduchi G. , Marconato N. , Marcuzzi D. , Mario I. , Milazzo R. , Pasqualotto R. , Patton T. , Pilan N. , Recchia M. , Rigoni-Garola A. , Segalini B. , Siragusa M. , Spolaore M. , Taliercio C. , Toigo V. , Zagorski R. , Zanotto L. , Zaupa M. , Zuin M. , Serianni G. 
Published: May 2022

Abstract
The negative-ion based neutral beam injector for heating and current drive of the ITER plasma (ITER HNB) is under development, at present focusing on the optimization of the full-scale plasma source in the SPIDER test stand. The production of H− or D− ions in the ion source is based on the low work function surfaces obtained by caesium evaporation. This paper describes the caesium conditioning procedure and the corresponding beam performances during the first operation of SPIDER with caesium. Technical solutions to overcome present limitations of the test stand are described. The influence of source parameters on the caesium effectiveness was investigated in short beam pulse operation; with total radio-frequency (RF) power of 400 kW and filling pressure below 0.4 Pa, and a limited number of extraction apertures, a negative ion current density of about 200 A m−2 was extracted in hydrogen, with beam energy lower than 60 keV. Beam optics and beam uniformity were assessed thanks to the acceleration of isolated ion beamlets. A possible procedure to accelerate a uniform beam was demonstrated at low RF power. The results obtained in this first investigation provided key indications on the operation of one of the largest existing sources of accelerated negative hydrogen-like ions.
A humidity compensation method for a temperature and humidity sensor
Authors: Yang Yuchuan , Liang Xiuxiu , Hong Ting , Li Xin 
Published: May 2022

Abstract
This paper introduces the method of humidity compensation in the temperature and humidity sensor to improve the measurement accuracy of humidity. The nonlinearity of humidity and humidity affected by temperature are compensated in circuit and data processing respectively. On the circuit, the sampling principle and the structure of the operational amplifier in the design are introduced. The data processing is mainly polynomial fitting of the chip test data by MATLAB software, so as to improve the humidity measurement accuracy. After the final fitting, the humidity error can reach ±1.5RH in the range of 10 °C to 50 °C.
Design and Implementation of a Direct Memory Access ControllerBased on Microcontroller Unit
Authors: Lu Chao , Yang Haosen , Wu Qi 
Published: May 2022

Abstract
With increasing IoT technology, the application of MCU is becoming more and more extensive, and higher requirements are put forward for the functions and data processing capabilities of MCU. This trend means the amount of data that the MCU needs to process in the system has increased sharply, so this paper proposes a hardware design scheme for a DMA controller based on the AHB-Lite protocol to replace the MCU to transfer data to improve system performance. The controller supports 8 transfer channels and adopts the method of fixed priority level arbitrating to select channels. The channel source and destination data width and burst type are configurable. In the process of data burst transfer, the condition of crossing the 1K address boundary is taken into consideration. At the same time, the design adopts the method that 8 transfer channels share a buffer FIFO to optimize the area of the controller.
Study on Short Circuit Current Calculation of EHV Overhead Line-GIL Hybrid Line
Authors: Jia Honggang , Yan Na , Wang Wei , Wang Zhe , Sun Yi , Xu Yiqing , Lu Shan 
Published: May 2022

Abstract
GIL electrical parameters are different from overhead lines. With the increasing application of GIL in actual projects, the influence of GIL needs to be considered when calculating the short-circuit current of the power grid. In this paper, the calculation of three-phase short-circuit current is carried out for the EHV double-circuit overhead line on the same tower with GIL. First, the electrical parameters of EHV GIL are calculated. The positive sequence resistance, reactance and capacitance values of a typical GIL are calculated. Secondly, EMTP-ATP software is used to modelling and simulation. The influence of GIL length on the short-circuit current and the position of short-circuit fault is studied respectively. Finally, the influence of the GIL unit length modelling accuracy and the grounding mode of the metal shell on the short-circuit current is studied. The research results of this paper can provide a theoretical reference for GIL simulation modelling and the evaluation of the impact of system short-circuit current.
Methods for increasing the conversion efficiency of solar cells
Authors: Wang Yuxuan 
Published: May 2022

Abstract
Solar energy is the most promising new energy. It is inexhaustible, and the use of solar energy will not damage the earth’s ecology and environment; Safe, no pollution, low utilization cost, and not restricted by geographical conditions. The solar cell converts light energy into electrical energy and transmits it to the load. When the non-uniform semiconductor (PN junction) is irradiated with light of appropriate wavelength, the electromotive force is generated inside the semiconductor due to the action of the internal field. Solar cell is a semiconductor photovoltaic element that converts light energy into electrical energy, using the photovoltaic effect of semiconductor. The main focus of solar cell design is to increase their conversion efficiency. This paper focuses on methods for increasing the conversion efficiency of solar cells, which can lead to more efficient energy for space technology. The conversion efficiency of a solar cell is defined as the ratio of the output electrical energy to the incident light energy. This paper focuses on the following methods to increase the conversion efficiency: enabling the solar cells to correspond to a wider spectrum and gradient doping. We have found that some of these methods can be applied to different solar cell materials. They are also quite realizable and can be put into practical production.
Fault identification of fan blade based on improved ResNet-18
Authors: Zhang Hengfu , Wang Fang 
Published: May 2022

Abstract
With the continuous development of the wind industry, wind turbine blade failure causes wind turbine shutdown, which damages the revenue of wind power. In order to more effectively detect the damage on the surface of wind turbine blade. By comparing ResNet-18 /50, VGG-19 and GoogLeNet models, ResNet-18 has the advantages of short training time and high accuracy. Therefore, ResNet-18 convolutional neural network is selected as the basic network, and a deep learning training and detection model is built based on MATLAB. In order to further optimize the model, multiple convolution kernel is selected for the main branch of residual structure of ResNet-18 to extract features, and add 3×3 pool layer, it is used to improve the learning ability of the model. In addition, Aadm, Sgdm and Rmsprop optimization algorithms are added to further improve the robustness of the model. Experiments show that the classification and recognition accuracy of the improved ResNet-18 model for fan blades is 94.17%, which is 2.5% higher than that of the original model. The improved ResNet-18 model has good recognition effect,it improves a faster and more accurate solution for fan blade surface damage identification in complex weather environment.
Analysis and Research of Pin Void for High Voltage Intelligent Power Module
Authors: Hua Qing , Wang Huanyu , Pan Zhijian , Zhang Tuming , Feng Yuxiang 
Published: May 2022

Abstract
Pin void is one of the key factors affecting the reliability of intelligent power module. It is difficult to accurately identify and measure whether it is a pin void and its size through X-ray equipment. This paper investigates the pin void analytical method of high voltage intelligent power module. An effective combinatorial analysis method is provided. Besides, pin void is compared and studied with different situations of reflow soldering, pin pressure bar and pin type in this research. The effects of different situations of these parameters on pin void are evaluated.
Design of Magnetic Levitation Shaftless Contra-Rotating Propeller and Feasibility Analysis of Drive System
Authors: Fang Xiaoyi 
Published: May 2022

Abstract
In order to solve the problems of vibration, noise, shaft seal and complex structure of the marine propeller, the author proposes a new type of magnetic levitation(Maglev) shaftless contra-rotating propeller(CRP), analyzes the mechanical structure design and component layout of the propeller, and uses 3D modeling software to model and assemble components. The propeller is mainly composed of rotors, shroud, stator winding, sensors, control circuit and other components, and its control system is further divided into a levitation system and drive system. Then the drive system of the propeller is studied, its mathematical model is analyzed, and the drive system model is built in MATLAB/Simulink to analyse the feasibility of the propeller drive system, and a PID controller is added to make the system have good dynamic response performance.
Research on multi-fault diagnosis method and test platform of main transmission Machinery of wind Turbine based on electrical signal
Authors: Shi Qiong , Zhou JingCi , Xiang JianPing , Shi YangChun 
Published: May 2022

Abstract
An optimised design was carried out based on the original semi-physical simulation system for the main drive chain of a wind turbine. The input of upper computer simulating wind condition, the safety control of electrical signal and vibration signal acquisition module, relay and AC contactor and dual motor control were added. Simultaneously, the simulation schemes of some common faults on the main drive of wind turbines were also designed in order to perform the experimental simulation of the single fault and multi fault. The primary purpose of simulation is to use practical approaches(such as FFT,EMD)to analyze the changes of the fault signals based on the collected electrical signals, and to determine whether there is a fault through comparison and theoretical analysis. In addition, it aimed for verifying the feasibility of electrical signals under multi-fault conditions, and discussing advantages of electrical signals over vibration signals.
Failure analysis of smoke lampblack machine crack
Authors: Kong Huanping , Jiang Tao , Zhao Kai , Liu Changkui 
Published: May 2022

Abstract
The smoke lampblack machine cracked in use. Through macro and micro morphology observation, energy spectrum detection, metallographic examination and finite element simulation calculation and analysis, the failure nature and reason of the smoke lampblack machine were determined. The results showed that the cracking property was corrosion fatigue, and the cracking of the smoke lampblack machine was caused by the damage of the protective layer in the vibration environment. It was suggested that the surface protection of smoke lampblack machine should be strengthened and the structural design of stress concentration should be improved.
Control system of the CYRCé beamlines
Authors: Maazouzi C. , Adam T. , Bouquerel E. , Pellicioli M. , Schuler J. , Rousseau M. , Traykov E. , Graehling P. 
Published: May 2022

Abstract
The first two extension beamlines from the CYRCé cyclotron have been developed and recently commissioned at IPHC Strasbourg. One beamline is devoted to radiobiological experiments, the PRECy project, while the other one is for testing silicon detector modules in the framework of the CMS experiment. The development of the control system of these beamlines is reported in this paper.
Drive beam sources and longitudinal shaping techniques for beam driven accelerators
Authors: Lemery F. , Andonian G. , Doebert S. , Ha G. , Lu X. , Power J. , Wisniewski E. 
Published: May 2022

Abstract
Linear colliders are an attractive platform to explore
high-precision physics of newly discovered particles. The recent
significant progress in advanced accelerator technologies has
motivated their applications to colliders which has been discussed
in the alegro workshop. In this paper we discuss structure
wakefield acceleration, namely collinear wakefield acceleration and
two-beam acceleration. We especially discuss available drive and
witness beam sources based on L and S-band radiofrequency
technology, and also summarize available and forthcoming
longitudinal shaping techniques to improve the overall acceleration
efficiency via the transformer ratio.
Cluster mean field plus density matrix renormalization theory for the Bose Hubbard models
Authors: Gaude Pallavi P , Das Ananya , Pai Ramesh V 
Published: May 2022

Abstract
The cluster mean-field with density matrix renormalization (CMFT + DMRG) method which combines the simplicity of the mean-field theory and the numerical power of the density-matrix renormalization group method is applied to understand the quantum phases of the one-dimensional Bose–Hubbard models. We show that the CMFT + DMRG method is an effective numerical technique with moderate computational resources to determine relevant order parameters and correlation functions of large one-dimensional systems. We apply the CMFT + DMRG for the Bose Hubbard and extended Bose Hubbard models to account for the superfluid, Mott insulator, and density wave phases in these models. Our results are in good agreement with the known phase diagram of these models, demonstrating the efficacy of this method.
Three-fold way of entanglement dynamics in monitored quantum circuits
Authors: Kalsi T , Romito A , Schomerus H 
Published: May 2022

Abstract
We investigate the measurement-induced entanglement transition in quantum circuits built upon Dyson’s three circular ensembles (circular unitary, orthogonal, and symplectic ensembles; CUE, COE and CSE). We utilise the established model of a one-dimensional circuit evolving under alternating local random unitary gates and projective measurements performed with tunable rate, which for gates drawn from the CUE is known to display a transition from extensive to intensive entanglement scaling as the measurement rate is increased. By contrasting this case to the COE and CSE, we obtain insights into the interplay between the local entanglement generation by the gates and the entanglement reduction by the measurements. For this, we combine exact analytical random-matrix results for the entanglement generated by the individual gates in the different ensembles, and numerical results for the complete quantum circuit. These considerations include an efficient rephrasing of the statistical entangling power in terms of a characteristic entanglement matrix capturing the essence of Cartan’s KAK decomposition, and a general result for the eigenvalue statistics of antisymmetric matrices associated with the CSE.
The discrete random energy model and one step replica symmetry breaking
Authors: Derrida Bernard , Mottishaw Peter 
Published: May 2022

Abstract
We solve the random energy model when the energies of the configurations take only integer values. In the thermodynamic limit, the average overlaps remain size dependent and oscillate as the system size increases. While the extensive part of the free energy can still be obtained by a standard replica calculation with one step replica symmetry breaking, it is no longer possible to recover the overlaps in this way. A possible way to adapt the replica approach is to allow the sizes of the blocks in the Parisi matrix to fluctuate and to take complex values.
An exactly solvable predator prey model with resetting
Authors: Evans Martin R , Majumdar Satya N , Schehr Grégory 
Published: May 2022

Abstract
We study a simple model of a diffusing particle (the prey) that on encounter with one of a swarm of diffusing predators can either perish or be reset to its original position at the origin. We show that the survival probability of the prey up to time t decays algebraically as ∼t
−θ(p,γ) where the exponent θ depends continuously on two parameters of the model, with p denoting the probability that a prey survives upon encounter with a predator and γ = D

A
/(D

A
+ D

B
) where D

A
and D

B
are the diffusion constants of the prey and the predator respectively. We also compute exactly the probability distribution P(N|t
c) of the total number of encounters till the capture time t
c and show that it exhibits an anomalous large deviation form

P

(

N
|

t

c

)

∼

t

c

−
Φ

N

ln

t

c

=
z

for large t
c. The rate function Φ(z) is computed explicitly. Numerical simulations are in excellent agreement with our analytical results.
Copolymeric stars adsorbed at a surface and subject to a force: a self-avoiding walk model
Authors: Janse van Rensburg E J , Whittington S G 
Published: May 2022

Abstract
We consider a model of star copolymers, based on self-avoiding walks, where the arms of the star can be chemically distinct. The copolymeric star is attached to an impenetrable surface at the end of an arm and the different monomers constituting the star have different interaction strengths with the surface. When the star is adsorbed at the surface it can be desorbed by applying a force, either at a vertex of degree 1 or at the central vertex of the star. We give some rigorous results about the free energy of the system and use these to establish the general form of the phase diagrams, and the orders of certain phase transitions in the system. We also consider the special case of spiders, i.e. stars constrained to have all the endpoints of their arms in the surface.