bluuebunny/crossref_metadata_2025_split huggingface dataset:
Er-doped fiber laser with regular and random distributed feedback
Authors: Skvortsov M.I. , Wolf A.A. , Fomiryakov E.A. , Treshchikov V.N. , Nikitin S.P. , Vlasov A.A. , Dostovalov A.V. , Babin S.A. 
Published: May 2022

Abstract
Using a point-by-point fs inscription technology, a Rayleigh reflector with unique characteristics has been designed and fabricated. The reflection coefficient of the structure with a length of 5 cm amounts to 0,03%, which corresponds to the reflection of 6-km SMF-28e+ fiber spool. The designed artificial Rayleigh scattering fiber in combination with distributed feedback (DFB) erbium-doped fiber laser allows to narrow the linewidth. A similar effect was observed in configuration with 25-km SMF-28e+ fiber spool, where it was used as an additional spectral filter. In both cases, an identical narrowing of the linewidth by an order of magnitude was observed at times less than 0,1 msec.
Precision laser diagnostics for LUXE
Authors: Prasad Rajendra 
Published: May 2022

Abstract
Strong field QED is an active research frontier. The investigation of fundamental phenomena such as pair creation, photon-photon and photon-electron interactions in the nonlinear QED regime are a formidable challenge both experimentally and theoretically. Several experiments around the world are being planned or in preparation to probe this strong field regime.
LUXE (Laser Und XFEL Experiment) is an experimental platform which envisages the collision of the high quality 16.5 GeV electron beam from the European XFEL accelerator with a 100 TW class high power laser. One of the unique features of LUXE is to measure the key observables such as pair rates (e
+
e
−) with unprecedented accuracy in the characterization of both beams together with ample statistics. The state-of-art detector technologies for high energy particle/photon detection enable percent level precision. The state-of-art high power lasers offer high quality laser beams, however, the residual shot-to-shot fluctuations coupled with the large nonlinearity of the processes under investigation form a particular challenge. An uncertainty of 5% on the absolute laser intensity already leads to a very large ( about 40%) uncertainty in the pair rate. Hence it becomes essential to control the laser parameters precisely.
To mitigate this issue a full suite of laser diagnostics is being currently developed at the JETI 40 laser in Jena with the aim of tagging the shot intensity to < 1%. In this presentation, details of the laser and the diagnostics suit for the single shot tagging of all the laser parameters will be presented. Moreover, results from an ongoing campaign to properly relay image the beam without significant distortion of the laser beam parameters for post-diagnosis will be discussed.
Depolymerization Performance of Pd/Al2O3 on Ether Biomass Model Molecules under Continuous Flow Reaction
Authors: Xu Jinyun , Li Ming , Ma Chao , Sun Yu , Li Minjing , Zhong Guoqiang , Zhao Di , Hu Xudong , Su Han , Yan Zhangyong , Cao Jingran , Xu Chao , Zheng Chunming , Sun Xiaohong 
Published: May 2022

Abstract
The ether model molecules BPE (phenylbenzyl ether), diphenyl ether (DPE) and phenoxyethylbenzene (PPE) of lignin were used as degradation raw materials, and Pd-Al2O3 was used as catalyst to react in batch reactor and continuous reactor, respectively. Pd-Al2O3 showed good degradation performance in batch reaction. The catalytic performance of three substances was compared in a flow reactor. The reasons of catalyst deactivation and the products adsorbed on the surface during the hydrogenolysis of BPE were studied.
Research on Cyber Physical Fusion Modeling of Photovoltaic System
Authors: Wang Chuanrui , Zhang Liting , Yang Yongwen , Li Qifen , Song Lifei 
Published: May 2022

Abstract
Cyber-Physical System (CPS) is a system that closely integrates physical computing, communication, and control for optimal regulation. At present, the interaction channel between the physical model and information model has not been opened up directly, so it is difficult to realize the optimal regulation of the energy internet. The key to solving this problem is to study the Fusion Modeling Technology of the two. Based on the concept of CPS, this paper proposed a fusion modeling method of the cyber-physical system after analyzing the interaction mechanism of the physical flow and information flow in CPS. The fusion of the information model and physical model was realized by corresponding with each other, which made the fusion model more accurate and reliable. A cyber-physical model of the photovoltaic system was simulated and analyzed to verify the superiority of proposed fusion modeling method. The simulation results showed that the PV output fluctuation of PV system with the cyber-physical model is much more smaller, and the output of the cyber-physical model is increased by 8.6%-10.2% compared to the physical model. It shows the influence of the information model on the system and the effectiveness of the cyber-physical model.
Theoretical study of spin-orbit coupling in Janus monolayer MA2Z4
Authors: Wu Liang , Zhou Wenzhe , Zhang Dehe , Ouyang Fangping 
Published: May 2022

Abstract
In this paper, based on first-principles calculations, we investigate the energy valley and spin-orbit coupling properties of Janus monolayer MA2Z4. The stability of different structures is illustrated. Due to the breaking of mirror symmetry, Rashba splitting occurs at the Γ point in the band structures of Janus monolayers WSiGeN4 and WSi2(NP)2. The relationship between Rashba spin-orbit coupling strength and potential energy gradient and d-orbital composition is explored. Janus monolayer WSi2(NP)2 has stronger Rashba effect than WSiGeN4 due to the strong asymmetry of the d orbital of W atom. These results help to promote the application of two-dimensional materials in spintronics and valleytronics.
Oxidation behavior of Mg-Gd binary alloys at elevated temperatures and the effect on corrosion property
Authors: Yu Xiaowen , Li Jing , Chen Sanxing , Wang Xiaodong , Huang Xiaoping 
Published: May 2022

Abstract
The oxidation behavior of magnesium alloy in air at the temperature of 500 ° C to 650 ° C was evaluated abstractly. Increasing Gd content in the alloy is beneficial for the enhanced of oxidation resistance. After Mg-1.5Gd and Mg-3.5Gd alloys were oxidized in air at 500 °C for 6h, dense and smooth oxide films dominated by MgO and Gd2O3 were formed on their surfaces. Gd2O3 content in the oxide films increased with increasing Gd content in the alloy. The oxidized alloys with high content of Gd (1.5 wt.% and 3.5 wt. %) exhibited good corrosion resistance when immersed in salt solution for 100 h.
Research progress on surface modification and application status of UHMWPE fiber
Authors: Wang Yixuan , Hou Ruixiang 
Published: May 2022

Abstract
Ultrahigh molecular weight polyethylene (UHMWPE) fiber is a high-performance material with superior properties of high strength and modulus, low density, wear resistance and corrosion resistance. But the development of UHMWPE fiber reinforced polymers is hindered due to its inert inactive surface and poor interfacial adhesion with polymer matrix. This work presents the research progress on surface modification techniques, including ‘dry’ treatment, strong oxidant treatment, chemical grafting and coating, of UHMWPE fiber and the mechanisms of the improvement on surface properties and interfacial adhesion strength between the UHMWPE fiber and the polymer matrix. Application status of UHMWPE fiber such as aerospace, ocean engineering and individual protection is introduced.
Preparation of porous silicon/metal composite negative electrode materials and their application in high-energy lithium batteries
Authors: Zhang Baoguo , Tong Ling , Wu Lin , Yang Xiaoyu , Liao Zhiyuan , Zhou Yilai , Hu Ya , Fang Hailiang 
Published: May 2022

Abstract
Porous silicon/metal composites have huge specific surface area, rich pore structure, tough framework system and low SEI film formation rate, and have great application prospects in the field of high-energy lithium batteries. Porous silicon/metal composites have abundant pore structure, which can greatly alleviate the volume effect of silicon during charging and discharging. The introduction of metal can increase the conduction rate and reduce the formation rate of SEI film. However, the development of a facile and rapid method to synthesize porous silicon/metal composites remains a challenge for current research. Based on the current research progress of porous silicon/metal composites and related literatures, in this paper, the preparation methods of porous silicon/metal composites in recent years are reviewed in detail, with a focus on their applications in the field of high-energy lithium batteries. Finally, the future development direction of porous silicon/metal composites is further prospected.
Study on the coupling properties of hydrogen PEMFC and air source heat pump
Authors: Ma Zhenxi , Cai Liang 
Published: May 2022

Abstract
A steady-state model for the coupling of a proton exchange membrane fuel cell and an air source heat pump (PEMFC–ASHP) is established in this paper. The influence of reaction pressure and relative humidity on the polarization curve and operating characteristics of PEMFC, as well as the influence of ambient temperature and compressor speed on the system performance are investigated. The results show that the increase of reaction pressure and relative humidity is conducive to the improvement of fuel cell output voltage and efficiency, and the influence of reactant gas relative humidity is more obvious. As the increase of ambient temperature and compressor speed, the heat pump efficiency and system efficiency decrease. The research results can provide theoretical guidance for the design and operation of the PEMFC–ASHP system.
Calculation of Flow Field and Vibration Analysis of Heat Exchanging Tube in Low Temperature Multi-effect Seawater Desalination Evaporator
Authors: Xiang Moyu , Li Luping , Liu Rui , Zhang Shi , Yang Changxing , Tang Guangyao 
Published: May 2022

Abstract
In this paper, a 1000t/d low-temperature multi-effect seawater desalination pilot plant (MED) is taken as the research object, a multi-phase flow (VOF) model is selected to describe the shell side flow field of the evaporator, and the overall direct simulation of the flow field on the shell side of MED is carried out by using the fluid mechanics calculation software Fluent. The vapor velocity field distribution around the evaporator tube bundle is obtained by calculation under stable test conditions. The influence of seawater spray density and evaporation temperature on flow field distribution and the vibration of tube bundle under different working conditions are researched. Research result shows that the spray density has little effect on steam velocity, but the maximum steam velocity is significantly affected by evaporation capacity of seawater. At the same time, when the evaporation capacity reaches a certain value, the phenomenon of flow resonance will occur in some areas of the evaporator, which will cause damage to the heat exchange tube bundle.
High performance Photodetector Based on PdSe2/MoS2 heterojunction
Authors: Shi Hongxiang , Chen Houjie , Wei Zhenhua , Luo Wei , Ouyang Fangping 
Published: May 2022

Abstract
Photodetectors are devices that instantaneously convert optical signals into electrical signals. With the advancement of science and technology, they are being widely used in various fields. Two-dimensional materials possess many unique and important properties, such as tunable band gap, etc., and have been widely used in photodetectors, and have been widely used in photodetectors in terms of responsivity (R), detectability (D*) and external quantum efficiency (EQE) Shows excellent performance. By building heterojunctions, 2D materials can serve as excellent photodetector components. Herein, We prepared two-dimensional multilayer PdSe2 thin films by a simple one-step direct selenization method and a high performance photodetector was fabricated based on vertically stacked MoS2/PdSe2 heterojunctions via a Van der Waals force mechanical transfer method. The fabricated device displays current rectification characteristics in darkness (on/off ratio > 102) and superior photovoltaic behavious under illumination. In addition, the MoS2/PdSe2 heterojunctions exhibits a remarkable responsivity of 2.7A·W-1 and a fast response time at 193/96 μs under 532nm laser irradiation. These results provide new opportunities for developing highly responsive and high-speed photodetectors to address integrated applications.
Research on assembly clearance of precision spherical coupling parts by point cloud analysis
Authors: Pan Xiaoyu , Liu Zhibing , Zhang Lu , Wang Xibin 
Published: May 2022

Abstract
Assembly clearance has a great influence on the performance of precision parts. Improper assembly clearance affects the working state and induces failure of parts. A method to analyze the assembly clearance of the precision spherical coupling parts by analyzing the points cloud was proposed. The least square center was used to find a rough center. Accurate center was searched near the least square center by the particle swarm optimization (PSO) algorithm based on the minimum zone method. Radical clearance and Z clearance of precision spherical coupling parts were calculated. Furthermore, the dynamic change of assembly clearance was also calculated by rotating the parts. The sphericity error evaluation results were improved obviously compared with other results. The accuracy of the evaluation results improved 4.51%∼28.97%.
Research on structural health monitoring method based on the inertial inclination sensor array
Authors: Tong Jianpeng , Chen Xiaolong , Yu Haoyu 
Published: May 2022

Abstract
With the development of human industrial processes, the infrastructure in different fields has been significantly improved, but potential failure will bring huge security risks. Structural health monitoring (SHM) using cloud computing and IoT technology has become a necessary safeguard to ensure the safe and reliable operation of large structures such as aircraft wings, pipelines, bridges, and dams. This paper innovatively proposes a new fitting method based on space deformation, which uses the inclination sensor array to obtain angle information, calculates the node deflection, and performs rational cubic spline interpolation fitting, invert the state of the measured component. At the same time, the theoretical and measured error analyses are carried out. In the length of 1800mm pipe, the error can be controlled below 5% when the number of sensors is greater than or equal to 5, which has an important engineering value.
Introduction of an Elevator Guide Shoe with Position and Lateral Force Monitoring Function
Authors: Feng Shuangchang , Chen Jie , Liang Yanchun 
Published: May 2022

Abstract
When the elevator guide rail is deformed or the building body is inclined, the car will produce a certain transverse force relative to the guide rail, resulting in serious wear on one side of the guide shoe. Since the existing guide shoe is fixed, when the car generates transverse force relative to the guide rail, only the transverse position of the guide shoe relative to the car can be adjusted. However, in practical application, it is difficult for elevator maintenance personnel to find this phenomenon in time. In most cases, when it is found that one side of the guide shoe is seriously worn, the guide shoe has been worn to an unusable state. This paper introduces an elevator guide shoe with position and lateral force monitoring function. The elevator guide shoe comprises a base fixed on the elevator car, a sliding support horizontally sliding connected with the base, a nylon block fixedly connected with the sliding support and in sliding contact with the elevator guide rail, and a displacement sensor and a force sensor arranged on the base to monitor the transverse sliding distance and transverse force between the sliding support and the base. The device has the advantages of position and transverse force monitoring function, compact overall structure, no need to change the original car layout, safety and reliability.
Elastic Distortion Calculation of a Controlled-Clearance Piston-Cylinder Assembly up to 1500 MPa Using Finite Element Method
Authors: Liu Chunguang , Zhang Zhongli , Hong Bian , Wang Can , Lin Zhenghao , Feng Miaolin , Zhang Jinming 
Published: May 2022

AbstractA controlled-clearance piston-cylinder assembly is modelled using finite element method (FEM). Elastic distortion of the piston-cylinder engagement gap is calculated by the FEM model and then is input to a fluid dynamics model to solving the pressure distribution which works as load in the FEM model. Accurate distortion-pressure solutions are obtained for measurement pressure of (100~1500) MPa by iterative calculations until a convergence of interest is reached. Results are generated for various jacket pressures maintaining balance. Dramatic rapid decent are found near the gap exit after a steady profile for both distortion and pressure distribution curves. Gap exit width can be two orders of magnitude smaller than the nominal gap clearance, and comparable to the irregularity of the piston and cylinder, introducing risks of inaccuracy or potential damage.
Application of Joint Filter Based on EMD and IIR in SINS
Authors: Xing Jinlong , Cai Tijing , Yang Gongliu 
Published: May 2022

Abstract
To solve the problem that the interference of vibration noise in the strapdown inertial navigation system (SINS) affects navigation accuracy, a joint noise reduction method based on Empirical Mode Decomposition (EMD) decomposition and Infifinite Impulse Response (IIR) low-pass digital filter was proposed. On the basis of EMD decomposition, Finally, SINS vehicle test is carried out. The results show that the combined noise reduction method based on joint noise reduction method based on EMD decomposition and IIR low-pass digital filter has an obvious effect on the noise reduction of accelerometer signal. After filtering, the horizontal positioning error of INS is better than 0.29 nautical miles, and the navigation accuracy is improved by 31%. Therefore, the joint noise reduction method based on EMD decomposition and IIR low-pass digital filter proposed in this paper can effectively improve the navigation accuracy of SINS.
A Small Leak Detection and Localization Method for Oil Pipelines Based on Improved Robust Principle Component Analysis
Authors: Shan Haiou , Zhu Yongqiang , Lang Xianming 
Published: May 2022

Abstract
When there is a small leak in the oil pipeline, their susceptibility to the influence of external noise prevents their detection based on the robust principal component analysis (RPCA) method, which does not consider the matrix of dense noise. Thus, to solve this problem, leak detection and localization method based on an improved robust principal component analysis (IRPCA) for pipelines is proposed. By solving a convex optimization function, this method can remove the dense noise contained in the collected data and improve the efficiency of small leak detection. In addition, the collected leakage data is analyzed. Leak detection is monitored by the combined index D2, which is a combined indicator that is composed of Hotelling’s T2 statistic and the SPE statistic. The experimental results show that the missing and false leak detection accuracies of the combined index D2 are much higher than those of the Hotelling’s T2 statistic and the SPE statistic separately. Furthermore, it verifies that the small leak localization method proposed in this paper has a good effect.
Analysis of surveillance system under epidemic conditions
Authors: Guo Quanying , Yang Mingjia , Peng Qiang , Wang Zhuoer 
Published: May 2022

Abstract
Under the situation of normalized epidemic prevention and control, how to establish a perfect and intelligent epidemic monitoring system has become an important prerequisite for epidemic prevention and control. The epidemic detection system reminds people to wear masks correctly through target detection technology to reduce the possibility of cross infection in public places; Through the use of original temperature measurement technology, the body temperature of personnel can be detected more quickly and conveniently to isolate patients from the source of epidemic infection; Through developed communication technology and communication means, the information identified by the system is retained and retrieved, and the identification accuracy and detection effect are continuously enhanced. This study systematically analyzes and summarizes the existing epidemic detection systems. According to the different key technologies and the emphasis of design schemes, this study summarizes the design types of “target detection”, “original temperature measurement technology”, “IOT communication technology”, and is committed to exploring an optimization scheme with parallel economic benefits and technical efficiency.
Research on eddy current testing method of mould molten steel
Authors: Liu Yanqing , Wang Zhichun 
Published: May 2022

Abstract
A double eddy current sensor is proposed to measure the liquid level of molten steel in mold and the liquid level of protective slag molten pool. The finite element models of the sensor and the measured object are established by using the finite element COMSOL simulation software. According to the different conductivity of each material in the mold, the measured object is set with the composition layer structure, and the liquid level of molten steel and the liquid level of protective slag molten pool are obtained by using double eddy current sensor and double frequency measurement. The factors affecting the measured value are analyzed and the structure of the sensor is optimized to detect the liquid steel in a large distance within 50-160mm, and the liquid level of molten pool in the mold is measured by high-frequency coil.
Single event effects on the RD53B pixel chip digital logic and on-chip CDR
Authors: Lalic J. , Fougeron D. , Madsen E. , Joly E.R.A. , Christiansen J. , Flores Sanz De Acedo L. , Menouni M. , Standke M. , Barrillon P. , Rymaszewski P. , Strebler T. 
Published: May 2022

Abstract
The RD53B chip for HL-LHC upgrades of ATLAS and CMS pixel detectors needs to provide reliable operation in a radiation hostile environment with inevitable Single Event Effects (SEE). To answer the challenge, substantial efforts are made to protect and evaluate the critical parts of the digital logic and to characterize the on-chip Clock and Data Recovery (CDR) circuit. The SEE sensitivity of the digital logic is evaluated by testing with both heavy-ions and protons. The on-chip CDR is characterized by measuring the SEE-induced phase shifts of its output clocks and their implication on the high-speed link stability.
Beam dynamics in dielectric laser acceleration
Authors: Niedermayer U. , Leedle K. , Musumeci P. , Schmid S.A. 
Published: May 2022

Abstract
We discuss recent developments and challenges of beam
dynamics in Dielectric Laser Acceleration (DLA), for both high and
low energy electron beams. Starting from ultra-low emittance nanotip
sources the paper follows the beam path of a tentative DLA light
source concept. Acceleration in conjuction with focusing is
discussed in the framework of Alternating Phase Focusing (APF) and
spatial harmonic ponderomotive focusing. The paper concludes with an
outlook to the beam dynamics in laser driven nanophotonic
undulators, based on tilted DLA grating structures.