bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Target Defect Detection Based on Machine Vision
Authors: Lu Chuqiao , Li Zhiyong , Shi Shaoyue , Peng Shaolong 
Published: May 2022

Abstract
The daily detection of highspeed electric multiple units (EMU) body is very important for China railway maintenance system. This paper proposes a new method based on machine vision to detect bolts and switches on EMU side skirt, which aims to replace manpower. Yolov3 network is used to identify and locate bolts and switches. After positioning, the status of bolts is detected through Alexnet network. Experiments show that the processing method can achieve the detection work efficiently and accurately. It is suitable for many cases such as insufficient illumination and non-vertical shooting of image samples, which has high robustness.
Parametric gap solitons in PT-symmetric optical structures
Authors: Komissarova M V , Lysak T M , Zakharova I G , Kalinovich A A 
Published: May 2022

Abstract
It is well known that quadratic nonlinearity and feedback through Bragg periodicity are the basis for parametric gap solitons. The major part of the relevant investigations refers to passive systems. At the same time, optical systems supplemented with active elements can demonstrate unusual properties. Asymmetry intrinsic to structures with parity-time (PT) symmetry is a bright confirmation of this statement. The interplay of nonlinearity, Bragg reflection and gain/loss profile can lead to the complicated pattern of wave interactions and novel results. In this study we address the properties of two-color solitons in complex PT symmetric periodic structures with quadratic nonlinearity. We focus on the case of single Bragg resonance. We reveal the region of parameters where stable parametric solitons may exist. We demonstrate that characteristics of forming solitons depend on the order of alteration of amplifying and absorbing layers.
Development of a Laser Frequency Stabilization and an Optical Transmission System for the Francium Electric Dipole Moment Search
Authors: Nakamura K , Nagase S , Nakashita T , Hayamizu T , Aoki T , Nagahama H , Ozawa N , Sato M , Yamane K , Fukase M , Uehara D , Takamine A , Sakemi Y 
Published: May 2022

Abstract
We developed a laser frequency stabilization and an optical fiber transmission system for the the francium electric dipole moment search. The absolute accuracy of a laser frequency stabilization scheme using a state-of-the-art commercial wavelength meter was 0.48 MHz at ±2 nm and -1.33 MHz at ±200 nm from calibration wavelength, respectively, and the frequency instability is below 10-9 with a standard deviation of 0.56 MHz over 60 hours. We also demonstrated that a 400 m long fiber laid between laboratories can transmit 30 mW of trapping laser light, which is sufficient for a magneto-optical trapping of francium. The polarization crosstalk in the fiber was stable at -25 dB over 12 hours of measurement.
Calculating critical temperature and critical exponents by self-similar approximants
Authors: Yukalov V.I. , Yukalova E.P. 
Published: May 2022

Abstract
Self-similar approximation theory allows for defining effective sums of asymptotic series. The method of self-similar factor approximants is applied for calculating the critical temperature and critical exponents of the O(N)-symmetric φ
4 field theory in three dimensions by summing asymptotic ε expansions. This method is shown to be essentially simpler than other summation techniques involving complicated numerical calculations, while enjoying comparable accuracy.
Coherent and incoherent superposition of transition matrix elements of the squeezing operator
Authors: Varró Sándor 
Published: May 2022

Abstract
We discuss the general matrix elements of the squeezing operator between number eigenstates of a harmonic oscillator (which may also represent a quantized mode of the electromagnetic radiation). These matrix elements have first been used by Popov and Perelomov (1969) long ago, in their thorough analysis of the parametric excitation of harmonic oscillators. They expressed the matrix elements in terms of transcendental functions, the associated Legendre functions. In the present paper we will show that these matrix elements can also be derived in an different form, expressed by the classical Gegenbauer polynomials. This new expression makes it possible to determine coherent and incoherent superpositions of these matrix elements in closed analytic forms. As an application, we describe multiphoton transitions in the system “charged particle + electromagnetic radiation”, induced by a (strong) coherent field or by a black-body radiation component (with a Planck-Bose photon number distribution). The exact results are compared with the semi-classical ones. We will show that in case of interaction with a thermal field, the semi-classical result (with a Gaussian stochastic field amplitude) yields an acceptable approximation only in the Rayleigh-Jeans limit, however, in the Wien limit it completely fails.
Spin-Polarized Particle Beams from Laser-Plasma Based Accelerators
Authors: Reichwein L , Hützen A , Büscher M , Pukhov A 
Published: May 2022

Abstract
Current laser-plasma based accelerators are promising options with respect to the acceleration of spin-polarized particle beams. We give an overview over the effects relevant during the acceleration process and more specifically discuss the acceleration of protons via Magnetic Vortex Acceleration (MVA). With the aid of particle-in-cell simulations we show that the length of the density down-ramp at the end of the plasma target affects the final beam quality regarding its collimation. The average spin-polarization of the obtained bunch remains largely robust at about 80% and only decreases for significantly longer ramps.
Axion Electrodynamics in Strong Magnetic Backgrounds
Authors: Villalba-Chávez S , Shabad A E , Müller C 
Published: May 2022

Abstract
The overcritical regime of axion-electrodynamics (AED) is investigated. For magnetic fields larger than the characteristic scale linked to AED, quantum vacuum fluctuations due to axion-like fields can dominate over those associated with the electron-positron fields. This hypothetical regime of the dominance of AED over QED is predicted to induce strong birefringence and screening effects. We show that, if the magnetic field lines are curved, extraordinary photons could be canalized along the field direction. It is also shown that the running QED coupling depends on the magnetic field strength, and for certain energy regimes, it could be screened almost to zero, making the QED building blocks very weakly interacting between each other. The impact of this phenomenon on the radiation mechanism of pulsars is discussed.
Research on the Implementation method of Anthropomorphic Trajectory during Sit to Stand Transfer based on Linkage Mechanism
Authors: Lv Ning , Xu Jinge , Zhao Liangliang , Wang Gang , Zhang Jing , Zhao Tao 
Published: May 2022

Abstract
Position and attitude change during sit to stand transfer is the most important change in daily life. On the basis of fully studying the existing equipment, position and attitude during sit to stand transfer is analysed, and the mathematical model of this process is established, the motion trajectory of hip joint during sit to stand transfer is normalized, then the feature points are extracted from motion trajectory. Based on the feature points, and using the linkage mechanism, the dimension synthesis of linkage mechanism is completed by graphic method, the method of realizing anthropomorphic motion trajectory during sit to stand transfer is given systematically based on linkage mechanism. The simulation results show that the designed mechanism can realize the anthropomorphic motion trajectory accurately during sit to stand transfer, and it lays a good foundation for the subsequent design of sit to stand assistance equipment.
Design and Performance Test of Silicone Fog Sealing Material for pavement
Authors: Zhong Yongqiang 
Published: May 2022

Abstract
On the basis of analyzing the characteristics and development status of the preventive curing technology of silicone material and fog sealing layer, the composition and proportion of silicone fog sealing material are designed. Silicone fog sealing layer consists of organosilicone resin, alkali, water, viscosifier, solvent, matrix asphalt and so on. The ratio of base asphalt to solvent is 1:4 and that of pure silicone material to matrix asphalt is 4:1. By preparing new materials, the advantages of silicone fog sealing material are summarized on the basis of performance experiment of silicone fog sealing material and field preventive maintenance construction effect test. Silicone asphalt fog sealing material has better waterproof performance, bond strength and viscosity than pure organic silicon material by performance test results.
Design and Implementation of Adjustable Voltage Source Module for Ion Chromatography
Authors: Wang Biao , Ming Zhongping , Chen Jing , Zhou Bin 
Published: May 2022

Abstract
Undeniably, adjustable power supply has many applications in ion chromatography. One example would be that a safe and stable adjustable power supply is indispensable for the driving part of the suppressor in ion chromatography. However, the traditional design of adjustable power supply suffers from high complexity, leading to its incompetence for practical engineering under the background of the continuous shortage of chips. Therefore, a method for an adjustable power supply module for ion chromatography is proposed and studied. Firstly, the microprocessor is used to output the MCPWM wave to control the output voltage of the flyback transformer. Secondly, the OCADC is used to collect the feedback voltage. Thirdly, the duty cycle of the MCPWM is adjusted using the PID algorithm to achieve constant voltage output. Further, hardware overcurrent protection is realized through MCPWM fast interrupt function. By this method, an adjustable power supply with a wide voltage output range, high current, and low voltage ripple can be output with less chip resources. Both the theoretical design scheme and the specific hardware circuit of this design is presented. Moreover, a simulation verification analysis is made. Finally comes the verification of the feasibility of this method.
Implementation of White Rabbit Time Synchronization System in State Acquisition System of High-energy Physics Experimental Device
Authors: Yang Zhanfei , Ma Yichao , Yang Wenhui , Zhang Yiyuan 
Published: May 2022

Abstract
The state acquisition system of high energy physics experimental device has very high requirements for the clock synchronization accuracy of each node. The White Rabbit (WR) distributed synchronous timing technology can realize multi node sub nanosecond clock distribution within several kilometers, and meet the requirements of clock synchronization accuracy of the system. This paper presents an implementation of WR timing system with ZYNQ 7045 as the core in the state acquisition system. This paper introduces the hardware design and implementation scheme of collector node, the implementation scheme of WR node, and the statistical data of WR-PTP time synchronization experiment results. The test results show that this method can realize the time synchronization between the nodes of the state collector, and the accuracy is better than 1 nanosecond. It can provide high-precision time synchronization function for the multi node signal acquisition system of high-energy physics experiment.
Research on speed control of permanent magnet synchronous motor based on RBF neural network tuning PID
Authors: Wang Wanli , Pang Han , Li Xincheng , Wu Yipeng , Song Xiufu 
Published: May 2022

Abstract
In order to solve the problem of insufficient speed regulation performance of conventional PID controller in multi gear switching of electric drive fracturing PMSM, RBF neural network parameter identification is used to set the PID parameters and improve the control effect of conventional PID controller. By analyzing the application characteristics of PMSM in electric drive fracturing truck, the RBF-PID controller and the speed control system model of PMSM are established based on s-function in MATLAB/SIMLINK, and the simulation research is carried out in combination with the application requirements. The results show that compared with the conventional PID controller, the RBF-PID controller has better real-time performance and robustness. The real-time response characteristics of the PMSM speed regulation control system are improved by 84% and the robustness is improved by 62%. The RBF-PID controller can effectively improve the working stability of PMSM.
A method of estimation for the area and direction of pipe crack
Authors: Wu Haichao , Lv Yingchun , Chen Yan 
Published: May 2022

Abstract
Crack direction will affect the ultrasonic wave reflected from it. Firstly, the correlation between crack direction and the reflected energy of ultrasonic is analyzed. Then, a mathematical model of crack direction and its reflected energy is developed due to the theory and methods of function approximation. Finally, aiming at the problem that the crack area must be known when using the model to estimate the crack direction, By observing the probability distribution of reflected wave energy of cracks with different areas and directions at different measurement distances, Using its law and mathematical model, an algorithm for estimating crack area and crack direction is designed. According to the related experiments, the study confirmed that both the estimation errors of the crack area and direction by the method are 5.25% and 8.21%, respectively.
Research and application of large size measurement calibration technology
Authors: Hu Chang’an , Li Gang , Jiang Tao , He Guosong 
Published: May 2022

Abstract
Indoor large-length standard device is an integrated large-size measurement and calibration device, which plays an important role in large-size measurement and calibration technology. In this paper, an indoor standard device for large length based on linear guide is introduced. The uncertainty of the measurement result is 0.14 μm+1×10-7L. The device can be used to calibrate the laser interferometer and laser tracker located inside the triangle, the standard steel tape measure, special length scale and ground scanner located outside the triangle. Taking the calibration of ground scanner as an example, the application of large size measurement calibration technology is described in detail.
Research on Magnetron Fault Reasoning Based on Fault Tree Reasoning Model
Authors: Wu Weiyi , Xie Lianjun , Gao Bingpeng 
Published: May 2022

Abstract
Aiming at the characteristics of magnetron of airport surveillance radar, such as short operation time, complexity and nonlinear vibration signal, a fault reasoning method based on T-S fuzzy fault tree model was proposed to realize fault reasoning analysis of magnetron of radar receiving and receiving system. A T-S fuzzy fault tree fault inference model is constructed by using the field expert’s opinion expressed by fuzzy number language set. The experimental results show that compared with the traditional manual fault detection method, this method can make more comprehensive and efficient inference analysis for the magnetron fault events. This method provides a new idea for the application of magnetron fault reasoning analysis in engineering.
Research on the detection method of wheel defects of electromagnetic ultrasonic phased array trains
Authors: Zhang Xiao-yu , Wang Zhi-chun 
Published: May 2022

Abstract
Train wheels are important moving parts of railway locomotives, with the development of China’s railways, the reliability of its quality is of great significance to ensure the safe operation of trains and reduce the danger of train driving. However, the traditional electromagnetic ultrasonic transduction efficiency is low, and the detection is difficult. Based on the principle of electromagnetic ultrasonic phased array detection, this paper uses the finite element method to establish a two-dimensional simulation model of Comsol Multiphysics 16-channel electromagnetic ultrasonic phased array, and adopts the detection method based on B-scan imaging to process the electromagnetic ultrasonic phased array echo signal and identify the internal defects of train wheels.
A Simultaneous Localization And Mapping Technology Based On Fusion of Radar And Camera
Authors: Xiao Junyao , Ying Dejun , Wu Zijian , Fang Zezheng 
Published: May 2022

Abstract
In order to solve the problem of incomplete and inaccurate environment perception in the process of simultaneous localization and mapping for autonomous vehicle, this paper proposes a SLAM system for autonomous vehicle by fusing LiDAR and depth camera, installing a relatively cheap single-line LiDAR, depth camera and odometer on the robot, designing a SLAM framework, and using the localization data of LiDAR to assist visual map building for a loosely coupled fusion. It is demonstrated that the method makes the environmental information for building the map richer and more accurate compared with the single sensor mapping. It also improves the perception ability of the driverless trolley for the environment, and provides a better basis for the path planning.
Considerations for a TeV collider based on dielectric laser accelerators
Authors: England R.J. , Niedermayer U. , Schächter L. , Hughes T. , Musumeci P. , Li R.K. , Kimura W.D. 
Published: May 2022

Abstract
Particle acceleration in dielectric microstructures powered
by infrared lasers, or “dielectric laser acceleration” (DLA), is a
promising area of advanced accelerator research with the potential
to enable more affordable and higher-gradient accelerators for
energy frontier science and a variety of other applications. DLA
leverages well-established industrial fabrication capabilities and
the commercial availability of tabletop lasers to reduce cost, with
axial accelerating fields in the GV/m range. Desirable luminosities
would be obtained by operating with very low charge per bunch but at
extremely high repetition rates. And as a consequence of its unique
operating parameter regime, coupling of the laser to the accelerator
can potentially be in the 50% range and with low beamstrahlung
energy loss due at the interaction point, making DLA a promising
approach for a future multi-TeV linear collider.
Arbitrary spatially variant polarization by unitary transformations in a common path interferometer
Authors: Olvera Santamaría M Á , Tlapale Aguilar A , Ostrovsky A S 
Published: May 2022

Abstract
We introduce a novel, common path interferometric technique, for generating hybrid spatially variant polarized fields and Poincaré beams. The technique is based on unitary polarization transformations employing a single spatial light modulator in a Sagnac-like common path interferometer. This technique allows generating arbitrary fields as a superposition of orthogonal elliptically polarized vortex basis with opposite handedness. We demonstrate the generation of such fields theoretically and verify it experimentally for azimuthal and spiral polarization. As an example of application, we generated a radially polarized ring-shaped field and characterize it by Stokes polarimetry.
The order of growth of an exponential series near the boundary of the convergence domain
Authors: Gaisina G. 
Published: May 2022

For a class of analytic functions in a bounded convex domain

G
G

that admit an exponential series expansion in

D
D

, the behavior of the coefficients of this expansion is studied in terms of the growth order near the boundary

∂
G

\partial G

. In the case where

G
G

has a smooth boundary, unimprovable two-sided estimates are established for the order via characteristics depending only on the exponents of the exponential series and the support function of

G
G

. As a consequence, a formula is obtained for the growth of the exponential series via the coefficients and the support function of the convergence domain

G
G

.
How I Diagnose Acute Leukemia of Ambiguous Lineage
Authors: Weinberg Olga K , Arber Daniel A 
Published: May 2022

Abstract

Objectives
Classification of acute leukemia involves assigning lineage by resemblance to normal progenitor cells. This approach provides descriptive information about the blast cells that is useful for disease monitoring, provides clues to pathogenesis, and can help clinicians select effective chemotherapeutic regimens. Acute leukemias of ambiguous lineage (ALALs) are those leukemias that either fail to show evidence of myeloid, B-, or T-lymphoid lineage commitment or show evidence of commitment to more than 1 lineage. The different treatment regimens for acute myeloid leukemia (AML) and acute lymphoblastic leukemia (ALL) make ALAL a challenge both diagnostically and therapeutically.

Methods
Current classification criteria have reduced the reported incidence of mixed-lineage leukemias by emphasizing fewer markers and categorizing some biphenotypic leukemias with recurrent cytogenetic abnormalities as other entities. Several recent studies have explored the genomic and epigenetic landscape of mixed-phenotype acute leukemia (MPAL) and have suggested a further refinement of the World Health Organization classification to emphasize the genomic heterogeneity of MPAL.

Results
Genomic and expression profile data for MPAL reveal mutations commonly seen in both AML and ALL, with T-/myeloid MPAL showing overlapping features with early T-cell precursor lymphoblastic leukemia.

Conclusions
Our review aimed to discuss the diagnostic challenges, recent genomic studies, and therapeutic strategies in this poorly understood disease.
Plasticity of snowy plover incubation behaviors in response to risks of nest predation
Authors: Ellis Kristen S , Larsen Randy T , Ghalambor Cameron K , Koons David N 
Published: May 2022

AbstractNest predation influences population dynamics and is thought to exert strong selection on the evolution of avian life history. Because parental behaviors can attract the attention of nest predators, incubating birds are predicted to decrease conspicuous behaviors at the nest-site and increase incubation constancy when risks of nest predation are high. We examined whether snowy plovers Charadrius nivosus responded to predator-specific risks of nest predation, using the number of off bouts and daily nest attendance (proportion of time spent incubating) as responses. We quantified risks using predator-specific hazard rates of nest mortality, which varied daily and were based on habitat characteristics at each nest. We assessed the influence of predator-specific risks of nest mortality on incubation behaviors using an individual-centering approach, allowing us to explain variation in incubation behaviors within- and among-breeding pairs. We found increased number of off bouts and nest attendance within-breeding pairs in response to increasing risks of nest predation by foxes (Vulpes spp.) and gulls (Larus spp.), but not coyotes (Canis latrans) and common ravens (Corvus corax). Among breeding pairs across habitats, we found increased nest attendance in response to higher risks of nest predation by foxes, but not coyotes, gulls, or ravens. Breeding pairs differed in the amount of behavioral plasticity they exhibited in response to risks of nest predation. Our results suggest that risks of nest predation differentially influence behavioral responses of snowy plovers depending on the predator species, and the amount of behavioral plasticity may depend on the characteristics of breeding adults.