bluuebunny/crossref_metadata_2025_split huggingface dataset:
The MICROSCOPE space mission: the first test of the equivalence principle in a space laboratory
Authors: Touboul Pierre , Métris Gilles , Rodrigues Manuel , Bergé Joel , Chhun Ratana , Foulon Bernard , Robert Alain 
Published: September 2022

Abstract
This paper introduces the current special issue focussed on the MICROSCOPE mission. This mission is the first experimental test in space of the weak equivalence principle (WEP) using man-made test-masses—as opposed to astronomical tests—with the goal to reach a precision two orders of magnitude better than ground-based experiments. Selected in 1999 by CNES as part of its MYRIADE microsatellite programme, the satellite was launched in 2016 and the mission lasted 2.5 years. This paper summarises the articles of the special issue and highlights the key technological and data analysis aspects that allowed for an unprecedented precision on the test of the WEP.
Result of the MICROSCOPE weak equivalence principle test
Authors: Touboul Pierre , Métris Gilles , Rodrigues Manuel , Bergé Joel , Robert Alain , Baghi Quentin , André Yves , Bedouet Judicael , Boulanger Damien , Bremer Stefanie , Carle Patrice , Chhun Ratana , Christophe Bruno , Cipolla Valerio , Damour Thibault , Danto Pascale , Demange Louis , Dittus Hansjoerg , Dhuicque Océane , Fayet Pierre , Foulon Bernard , Guidotti Pierre-Yves , Hagedorn Daniel , Hardy Emilie , Huynh Phuong-Anh , Kayser Patrick , Lala Stephanie , Lämmerzahl Claus , Lebat Vincent , Liorzou Françoise , List Meike , Löffler Frank , Panet Isabelle , Pernot-Borràs Martin , Perraud Laurent , Pires Sandrine , Pouilloux Benjamin , Prieur Pascal , Rebray Alexandre , Reynaud Serge , Rievers Benny , Selig Hanns , Serron Laura , Sumner Timothy , Tanguy Nicolas , Torresi Patrizia , Visser Pieter 
Published: September 2022

Abstract
The space mission MICROSCOPE dedicated to the test of the equivalence principle (EP) operated from April 25, 2016 until the deactivation of the satellite on October 16, 2018. In this analysis we compare the free-fall accelerations (a
A and a
B) of two test masses in terms of the Eötvös parameter

η

(

A,B

)

=
2

a

A

−

a

B

a

A

+

a

B

. No EP violation has been detected for two test masses, made from platinum and titanium alloys, in a sequence of 19 segments lasting from 13 to 198 h down to the limit of the statistical error which is smaller than 10−14 for η(Ti, Pt). Accumulating data from all segments leads to η(Ti, Pt) = [−1.5 ± 2.3 (stat) ± 1.5 (syst)] × 10−15 showing no EP violation at the level of 2.7 × 10−15 if we combine stochastic and systematic errors quadratically. This represents an improvement of almost two orders of magnitude with respect to the previous best such test performed by the Eöt-Wash group. The reliability of this limit has been verified by comparing the free falls of two test masses of the same composition (platinum) leading to a null Eötvös parameter with a statistical uncertainty of 1.1 × 10−15.
Paths from stationary to chaos in passively mode-locked fiber lasers: research progress of soliton pulsations and soliton explosions
Authors: Han Ying , Gao Bo , Hao Yabin , Ponraj Joice Sophia , Ma Chunyang , Huo Jiayu , Wu Ge , Li Yingying , Al-Amoudi Bashaer Omar , Wageh S , Al-Ghamdi Ahmed A , Liu Lie , Zhang Han 
Published: September 2022

Abstract
Research has shown that passively mode-locked fiber lasers produce chaotic output, which has caught the attention of physicists, chemists, and bio-scientists owing to their wide bandwidth, good random characteristics, and strong anti-interference. In passively mode-locked fiber lasers, soliton pulsations and soliton explosions with period bifurcation characteristics have been demonstrated to be effective paths to chaos as far as 20 years ago. However, due to the lack of real-time spectrum measurement techniques, the earlier research investigated their theoretical aspect. In recent years, the rise of the dispersive Fourier transform technique has activated an upsurge of experimental research. The present work first discussed the theoretical model of passively mode-locked fiber lasers, the computational analysis method of soliton dynamics, and the related theory of the dispersive Fourier transform technique. In addition, we presented and evaluated the progress of the theoretical and experimental research on soliton pulsations as well as on soliton explosions in passively mode-locked fiber lasers. Finally, we proposed the future research directions of the soliton pulsations and soliton explosions that offer great promise for scientific discoveries.
Generalization of microscopic multipoles and cross-correlated phenomena by their orderings
Authors: Kusunose Hiroaki , Hayami Satoru 
Published: September 2022

Abstract
The generalization of the atomic-scale multipoles is discussed. By introducing the augmented multipoles defined in the hybrid orbitals or in the site/bond-cluster, any of electronic degrees of freedom can be expressed in accordance with the crystallographic point group. These multipoles are useful to describe the cross-correlated phenomena, band-structure deformation, and generation of effective spin–orbit coupling due to antiferromagnetic ordering in a systematic and comprehensive manner. Such a symmetry-adapted multipole basis set could be a promising descriptor for materials design and informatics.
Nanoporous GaN on p-type GaN: a Mg out-diffusion compensation layer for heavily Mg-doped p-type GaN
Authors: Lee Kwang Jae , Nakazato Yusuke , Chun Jaeyi , Wen Xinyi , Meng Chuanzhe , Soman Rohith , Noshin Maliha , Chowdhury Srabanti 
Published: September 2022

Abstract
Embedding p-type gallium nitride (p-GaN) with controlled Mg out-diffusion in adjacent epitaxial layers is a key for designing various multi-junction structures with high precision and enabling more reliable bandgap engineering of III-nitride-based optoelectronics and electronics. Here, we report, for the first time, experimental evidence of how nanoporous GaN (NP GaN) can be introduced as a compensation layer for the Mg out-diffusion from p-GaN. NP GaN on p-GaN provides an ex-situ formed interface with oxygen and carbon impurities, compensating for Mg out-diffusion from p-GaN. To corroborate our findings, we used two-dimensional electron gas (2DEG) formed at the interface of AlGaN/GaN as the indicator to study the impact of the Mg out-diffusion from underlying layers. Electron concentration evaluated from the capacitance-voltage measurement shows that 9 × 1012 cm−2 of carriers accumulate in the AlGaN/GaN 2DEG structure grown on NP GaN, which is the almost same number of carriers as that grown with no p-GaN. In contrast, 2DEG on p-GaN without NP GaN presents 9 × 109 cm−2 of the electron concentration, implying the 2DEG structure is depleted by Mg out-diffusion. The results address the efficacy of NP GaN and its’ role in successfully embedding p-GaN in multi-junction structures for various state-of-the-art III-nitride-based devices.
Gyrokinetic study of transport suppression in JET plasmas with MeV-ions and toroidal Alfvén eigenmodes
Authors: Mazzi S , Garcia J , Zarzoso D , Kazakov Ye O , Ongena J , Dreval M , Nocente M , Štancar Ž , Szepesi G 
Published: September 2022

Abstract
The impact of fast ions, generated in the MeV-range through the efficient application of the three-ion scheme in JET plasmas, on the turbulence properties is presented through complex numerical simulations. The suppression of the ion-scale turbulent transport is studied by means of in-depth gyrokinetic numerical analyses. Such a suppression is demonstrated to be achieved in the presence of toroidal Alfvén eigenmodes (TAEs) destabilized by the highly energetic ions. Details on the TAE excitation are also provided with a multi-code analysis. The inherently nonlinear and multi-scale mechanism triggered by the fast ions, also involving the high-frequency modes and the large-scale zonal flows, is deeply analyzed. Such mechanism is thus demonstrated, with experimental validating studies, to be the main cause of turbulence suppression and improvement of ion thermal confinement. Additional simulations address the implications of reversed shear magnetic equilibrium on the turbulent transport.
Enhanced nonlinearity of four-wave mixing via Rydberg–Rydberg interactions
Authors: Zhang Xiao-Jun , Chang Huan , Huo Jia-Yao , Wu Jin-Hui 
Published: September 2022

Abstract
We investigate the four-wave mixing (FWM) nonlinearity in an ensemble of cold Rydberg atoms with each of them regarded as a double-ladder system. The interaction is studied from the view of generating a signal field in virtue of three applied lasers. Using an approach beyond mean-field theory, we solved the equations for the one-body and two-body correlators under perturbation, and show that the system possesses not only a local FWM nonlinearity, but also a much larger nonlocal nonlinearity due to the Rydberg–Rydberg interaction which can be further strengthened by increasing the atomic density. The results obtained may have promising applications in the quantum information processes involving the FWM nonlinearity, such as the generation of squeezed or entangled states.
Vector stability in quadratic metric-affine theories
Authors: Jiménez-Cano Alejandro , Maldonado Torralba Francisco José 
Published: September 2022

Abstract
In this work we study the stability of the four vector irreducible pieces of the torsion and the nonmetricity tensors in the general quadratic metric-affine Lagrangian in 4 dimensions. The goal will be to elucidate under which conditions the spin-1 modes associated to such vectors can propagate in a safe way, together with the graviton. This highly constrains the theory reducing the parameter space of the quadratic curvature part from 16 to 5 parameters. We also study the sub-case of Weyl-Cartan gravity, proving that the stability of the vector sector is only compatible with an Einstein-Proca theory for the Weyl vector.
Reducing mean first passage times with intermittent confining potentials: a realization of resetting processes
Authors: Mercado-Vásquez Gabriel , Boyer Denis , Majumdar Satya N 
Published: September 2022

Abstract
During a random search, resetting the searcher’s position from time to time to the starting point often reduces the mean completion time of the process. Although many different resetting models have been studied over the past ten years, only a few can be physically implemented. Here we study theoretically a protocol that can be realised experimentally and which exhibits unusual optimization properties. A Brownian particle is subject to an arbitrary confining potential v(x) that is switched on and off intermittently at fixed rates. Motion is constrained between an absorbing wall located at the origin and a reflective wall. When the walls are sufficiently far apart, the interplay between free diffusion during the ‘off’ phases and attraction toward the potential minimum during the ‘on’ phases give rise to rich behaviours, not observed in ideal resetting models. For potentials of the form v(x) = k|x − x
0|
n
/n, with n > 0, the switch-on and switch-off rates that minimise the mean first passage time (MFPT) to the origin undergo a continuous phase transition as the potential stiffness k is varied. When k is above a critical value k
c, potential intermittency enhances the target encounter: the minimal MFPT is lower than the Kramer time and is attained for a non-vanishing pair of switching rates. We focus on the harmonic case n = 2, extending previous results for the piecewise linear potential (n = 1) in unbounded domains. We also study the non-equilibrium stationary states emerging in this process.
An improved engineering method for bearing capacity calculation of stiffened curved composite panels
Authors: Wang Zhe , Chen Xiangming , Li Xinxiang , Zou Peng , Yang Junchao , Bi Xue 
Published: September 2022

Abstract
The application of composite materials in the primary structures of large aircraft fuselage is a development trend in recent years. As an indispensable structure in design and structure selection, accurate and efficient evaluation of its performance is of great significance to reduce the research cost. In this paper, the bearing capacity of stiffened curved composite panel is calculated through an improved engineering calculation method, and the effectiveness of the method is verified by test, which provides technical support for the rapidly design and selection of stiffened curved composite panels.
Research on process improvement and optimization design of a certain type of mine explosion-proof electric control box
Authors: Lu Zhiqi 
Published: September 2022

Abstract
In order to reduce the cost of electric control box and improve its beauty and universality, the design structure of a mine explosion-proof electric control box is improved in view of the disadvantages existing in the use of a certain type of mine explosion-proof electric control box; At the same time, for the problems of heavy self-reliance, high processing cost and poor heat dissipation of the existing electric control box, by changing the material, plate thickness, stiffener treatment at the appropriate position, or changing the plate structure of the box, the stress analysis is carried out under the pressure conditions, and the box with two schemes meeting the service conditions is designed and improved. At the same time, the manufacturing cost and heat dissipation of the box before and after the improvement are compared, which can be used as a reference for the design of electric control box in the future.
Grid-connected power oscillation study of hybrid storage direct-drive wind farms based on SVG
Authors: Zhang Chao , Xin shaojie , Xu Cong 
Published: September 2022

Abstract
This paper studies the control strategy of hybrid energy storage to suppress power fluctuation of direct-drive wind turbine based on static var generator, and proposes a grid-connected power oscillation suppression of hybrid energy storage direct-drive wind turbine based on static var generator (SVG). Method, the static var generator is mainly to solve the reactive current generated by the large and impact load and the resulting reactive power, and the SVG connected in parallel with the fan outlet busbar performs reactive power coordinated control to support the grid voltage. This control strategy control The lead-acid battery compensates for the intermediate frequency power fluctuation and the super capacitor (SC) quickly absorbs the high frequency power fluctuation, thereby smoothing the wind power and improving the power quality. sexual demands. Finally, a system simulation model is established in the Matlab/Simulink environment to verify the effectiveness of the proposed method.
Fractal Dimension Fitting of Virtual Material and Experimental Verification
Authors: Fu Yongling , Wang Zeqi , Li Wanguo 
Published: September 2022

Abstract
Virtual material is a dynamic model of mechanical contact surface, which is suitable for finite element simulation. This method can characterize the stiffness and damping of the contact surface well by using fractal geometry theory to describe the contour of the contact surface. Based on standard W-M function, we verify the accuracy of the fractal dimension calculated by wavelet transform, and then fit the fractal dimension of machined surfaces with different roughness. Using the fractal dimension, we calculate the virtual material parameters to establish the finite element model of the unit specimen. Finally, we carry out the experimental modal analysis to examine reproduce the virtual material method.
Study on Friction and Wear Properties of 23CrNi3Mo Carburized Steel under Water Lubrication
Authors: Wang Jialin , Han Bin , Zhu Shaohua , Sun Xinhao 
Published: September 2022

Abstract
In this paper the friction and wear of 23CrNi3Mo carburized steel under water lubrication were studied. The friction and wear properties of carburized steel sliding with stainless steel, GCr15, Al2O3 and ZrO2 balls were analyzed by tribometer, 3-D topography and SEM. The results show that compared with other materials, ZrO2 and carburizing steel have better tribological properties. Compared with Al2O3, the wear depth of carburized steel sliding with ZrO2 is reduced by 41% at the load of 2 N and 50% at the load of 10 N. In the load range of 2N-10N, the wear rate of carburized steel is the lowest when rubbing with ZrO2, and it gradually decreases when the load increases. Combined with SEM and Raman spectrum analysis, Oxide film was formed on the surface of carburized steel during the sliding test of ZrO2 and carburized steel. This oxide film was mainly composed of Fe3O4 and Fe2O3, which effectively reduces the friction coefficient and wear rate of 23CrNi3Mo carburized steel under water lubrication.
Comparison Study on Machined Surface Integrity and Corrosion Resistance of 2024 Aluminum Alloy
Authors: Huang Hao , Niu Jintao , Li Jiliang , Lin Qichao , Qiao Yang 
Published: September 2022

Abstract
2024 aluminum alloy is an engineering equipment material with broad application prospects, which can be used in space flight and shipbuilding industry. However, the lack of corrosion resistance hinders its further application. The effects of milling and further shot peening processes on the surface integrity of 2024 aluminum alloy were investigated. Electrochemical polarization measurements were performed in 3.5wt% NaCl solution to characterize the corrosion resistance of milling alone surfaces and the further shot-peening process surfaces after milling. Experimental results reveal that the surface residual stress and microhardness of the shot-peened surfaces are much higher than those of the only milling surfaces owing to the severer plastic deformation induced by further shot peening process. While the shot-peened surfaces are roughened with the higher surface roughness. Under the synergic effects of three terms mentioned above, the corrosion potential of shot-peened surfaces is much positive than that of milled ones, meaning the corrosion resistance after shot peening is better. The comparison test gives a way to enhance the corrosion behavior of 2024 aluminum alloy milled surfaces.
Calibration error study of binocular stereo camera
Authors: Wu Hao , Hao Weidong , Sun Yulu , Wang Zhihao , Huang Yiren 
Published: September 2022

Abstract
The calibration accuracy of the camera largely affects the accuracy of 3D measurement, so this paper researches on the calibration error of the binocular stereo camera, introduces the imaging model of the camera, conducts the experiment of calibration according to the principle of Zhang Zhengyou's calibration, and responds to the calibration accuracy by the reprojection error, the experimental results show that the calibration meets the requirements and the average error can reach 0.05pixels.
Study on output characteristics of Offset Twist-roller Frictional Transmission Mechanism
Authors: Li Baoyu , Chen Ning , Chen Yukang , Xie Xin , Fan Dapeng 
Published: September 2022

Abstract
According to the requirements of high resolution and compact space of a rotational-double-prism system, combined with its practical application characteristics of small load and low speed, an offset twist-roller frictional transmission mechanism is proposed. Compared with the clearance elimination gear transmission mechanism, it has the advantages of high output resolution, adjustable reduction ratio, simple structure and low cost. The influence of twist angle on the output characteristics of offset twist-roller frictional transmission mechanism is studied by experiment. The results show that the larger the twist angle, the smaller the driving torque of the driven wheel, the larger the transmission ratio of the mechanism, the larger the fluctuation range of output angular velocity and transmission ratio, and the more unstable the transmission. The transmission ratio of the mechanism in stable transmission is about 30, which is much higher than that in single-stage cylindrical gear drive. The output angular resolution of the mechanism is better than 0.005°, meeting the system requirements. Through the above analysis, it lays a foundation for the application of offset twist-roller frictional transmission mechanism in rotational double prisms system.
Design and Rig Test of Hydro-Pneumatic Spring for Heavy Off-Road Vehicles
Authors: Liang Yinggang , Zhang ZhenHua , Lin ShuFeng 
Published: September 2022

Abstract
In order to meet the requirements of heavy off-road vehicles for long-stroke elastic elements, a new type of double-chamber hydro-pneumatic spring was innovatively designed. According to the structure and working characteristics, the mathematical models of the spring under two working conditions are established, and its stiffness characteristics are analyzed. The force and displacement data of the spring at different frequencies were obtained by rig test. The static friction, damping and elastic force of the spring are separated. Based on the data of elastic force and displacement, the polytropic exponent of hydro-pneumatic spring under different working conditions is identified by curve fitting. The structure and theoretical model of double-chamber hydro-pneumatic spring designed in this paper provide support for the application of hydro-pneumatic spring in long-stroke off-road vehicle.
Effect of Preload on Frame Stiffness of 1600 kN Closed Double Point Mechanical Press
Authors: Wang Chao , Cui Fujun , Liu Wenlun , Wang Qiang 
Published: September 2022

Abstract
A 1600kN closed double point press is used for the punching process of U-shaped longitudinal beam and more than 10 independent die frames are arranged. Different holes require different punching forces, and multi-station punching will cause eccentric loads, while preload and off-centre load are important factors affecting the precision of the combined frame of closed press. In this paper, a 1600kN press combined frame is designed based on the U-shaped longitudinal beam punching process and the three dimensional model of 1600kN press frame is established by Solidworks. The finite element analysis of preload, symmetrical load and off-centre load was carried out by Ansys Workbench. The deformation of upper beam in Z direction and the relationship between eccentric load factor i and the maximum deformation difference △h can be obtained, which has important application value to improve the manufacturing accuracy of this type of press.
Research on mechanical resonance of Precise cable drive systems
Authors: Xie Xin , Zheng Jieji , Tan Ruoyu , Li Baoyu , Yu Bin , Fan Dapeng 
Published: September 2022

Abstract
Precise cable drive is a light, concise and efficient spatial friction flexible transmission mode, which has the characteristics of flexible layout, lightweight and miniaturization. It is a good choice for Acquiring tracking and pointing applications (ATPs). But the cable drive mechanism (CDM) is easy to cause large-scale speed oscillation in the process of performing tasks as cable compliance. This paper focused on the mechanical resonance in a practical full-closed loop positioning control system. A dynamic model with the electro-mechanical and rigid-flexible coupling characteristics is proposed, which is capable to analyze the global influence factors on speed oscillation. The parametric sensitivities have been conducted to investigate the effects of design parameters on mechanical resonance.