bluuebunny/crossref_metadata_2025_split huggingface dataset:
ASPECT-BET: An sdd-SPECTrometer for BETa decay studies
Authors: Biassoni Matteo , Brofferio Chiara , Capelli Silvia , Cappuzzello Francesco , Carminati Marco , Cavallaro Manuela , Coraggio Luigi , Cremonesi Oliviero , Gregorio Giovanni De , Fiorini Carlo , Itaco Nunzio , Nava Andrea , Pozzi Stefano 
Published: March 2023

Abstract
We present the status of the ASPECT-BET (An sdd-SPECTrometer for BETa decay studies) project which is aimed at developing a new detection strategy to perform high-precision, high-accuracy measurements of the energy spectra of beta decays of interest for the physics community, in particular in the field of nuclear physics, double beta decay and reactor neutrinos. The aim is to exploit a relatively novel spectroscopic technique based on Silicon Drift Detectors. An SDD-spectrometer, equipped with all the ancillary detectors required to reject events with only a partial energy deposition in the main sensitive elements, will provide high-statistics and virtually zero-background data. In order to isolate and study the systematic uncertainties, the statistical error on the measured spectra has to be reduced to a negligible level, balancing source activity, measurement duration and background. Reliable and well understood Montecarlo simulations are a key component of this application, as they provide a model for the response functions of the spectrometer, to be deconvolved from the data in order to correctly reconstruct the original spectral shapes. Thanks to the flexibility of the SDD detector technology, the here presented spectrometer could be coupled to a variety of beta sources, ranging from nuclei deposited on the surface of SDDs to minimise source self-absorpion to short-lived isotopes created and collected at unstable isotope beams like ISOLDE at CERN or the exotic beams at LNS, Catania. The current status of the technology, as well as some preliminary sensitivity studies, are presented and discussed.
Study of fundamental symmetries in the few-nucleon systems
Authors: Viviani M. 
Published: March 2023

Abstract
In this contribution we present two studies of fundamental symmetries in light nuclei: the investigation of CP violation via the calculation of the electric dipole moments (EDMs) of the deuteron, 3H and 3He, and the possible existence of a new bosonic particle, the so-called X17, in the 3H(p, e
+
e
−)4He and 3He(n, e
+
e
−)4He reactions. The advantage to perform these investigations in few-nucleon systems is related to the possibility to compute accurate ab initio bound- and continuum-states wave functions using well established nuclear interactions. Therefore, if these effects are observed, they can be unambiguously related to underlying beyond Standard Model theories.
Core-proton coupled nature of the 11/2+ state in 131 Sb probed by lifetime measurements
Authors: Bottoni S. , Gamba E. R. , De Gregorio G. , Gargano A. , Leoni S. , Fornal B. , Brancadori N. , Ciconali G. , Crespi F. C. L. , Cieplicka-Oryńczak N. , Iskra L. W. , Colombi G. , Kim Y.H. , Köster U. , Michelagnoli C. , Dunkel F. , Esmaylzadeh A. , Gerhard L. , Jolie J. , Knafla L. , Ley M. , Régis J.-M. , Schomaker K. , Sferrazza M. 
Published: March 2023

Abstract
The structure of the

11

/

2
1
+

state in 131Sb was investigated at the LOHENGRIN spectrometer of Institut Laue-Langevin via neutron-induced fission of 235U and lifetime measurements, yielding

T

1
/
2

=
3
(
2
)

, at the edge of the sensitivity of the experimental method. This first result for the

11

/

2
1
+

state half-life in neutron-rich Sb isotopes provides a quadrupole reduced transition probability to the ground state of

B
(
E
2
)
=

1.4

−
0.6

+
1.5

W.u., very close to the

B
(
E
2
;

2
1
+

→

0
1
+

)

in 130Sn. Realistic shell-model calculations reproduce well both the experimental level scheme of 131Sb and the

B
(
E
2
;

11

/

2
1
+

→

7
/

2
1
+

)

value, indicting a dominant

2
+

(

130

Sn
)
⊗
π

g

7
/
2

core-proton coupled configuration for the

11

/

2
1
+

state.
Nuclear structure studies in mirror nuclei
Authors: Tonev D. , de Angelis G. , Deloncle I. , Goutev N. , De Gregorio G. , Pantaleev I. L. , Demerdjiev A. , Geleva E. , Dimitrov D. T. , Genchev S. G. , Lakov N. , Lalev V. L. , Yavahchova M.S. 
Published: March 2023

Abstract
The nuclear structure of the A=31 and A=47 mirror couples produced by two fusion evaporation reactions has been elaborated, utilizing the Doppler-shift attenuation method. Excited states in 31P and 31S were populated using the 1p and 1n exit channels, respectively, of the reaction 20Ne + 12C, while in 47Cr and 47V couple excited states were populated based on 28Si + 28Si reaction, as products of 2αn and 2αp exit channels. The A=31 mirror couple was studied utilizing Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro with GASP multidetector array and for A=47 one - with the EUROBALL array using XTU Tandem also in Legnaro. In both cases the lifetime measurements in mirror couples at the same experiment open possibilities for investigations of isospin symmetry. Determined B(E1) strengths in the mirror nuclei 31P and 31S allow to extract the isoscalar component, which can reach up to 24% of the isovector one. The B(E1) values can be modeled by the Equation of motion method. In the case of A=47 mirror couple, the quadrupole moments can be described by shell-model calculations.
What can we learn from experiments with high-brilliance gamma beams?
Authors: Balabanski Dimiter L. 
Published: March 2023

Abstract
An overview of the main directions of present-day studies with quasimonochromatic γ beams is presented with an emphasis on the research opportunities which will be provided to the users at the Extreme Light Infrastructure Nuclear Physics (ELI-NP) facility at Magurele near Bucharest. Experiments with γ beams at the extremes of high temperature and high neutron-to-proton ratios will be discussed. The opportunities for nuclear structure studies with γ rays with orbital angular momentum (OAM) are outlined and a few selected physics problems and classes of experiments, related to, e.g., changes of photonuclear cross sections in reactions with OAM photons, as well as the possibility to address nuclear excitations with higher multipolarity are discussed. The perspectives for studies of exotic nuclei within the Gamma Factory experiment at CERN are discussed, too.
Influence of Novel Electromagnetic Strengthening on Mechanical Properties of Spaceborne Elastic Components
Authors: Hua Xiong , Xiao Yong , Gao Xiang , Yang Zhao , Wang Lipeng , Wang Zicheng 
Published: March 2023

Abstract
Numerous elastic components are widely used in the power drive, vibration control, and pressure compensation of deployable antennas. Thus, the deployment and normal service of the antenna rely on the consistency and stability of their mechanical properties. They offer important support for deployable antenna products to meet the requirements of shape and surface accuracy. This study found that the electromagnetic field can improve the stiffness, hardness, and stability of the space-borne spring. In this experiment, the hardness variance distribution is reduced by 40.79%, the creep resistance is improved by 45.76% to 61.48%, and fatigue life is increased by 69%. With the enhancement of mechanical properties, the uniformity, consistency, and individual differences of the spring are improved. According to the observations of metallographic microstructure, fine grain strengthening and precipitation strengthening mainly contribute to the reinforcing effect. It is found that the electromagnetic field has an important influence on improving the performance stability and consistency of the space-borne elastic element structure, and this technology has great prospects in the future aerospace field.
Aerodynamic Heat Simulation Heating System Based on Fuzzy PID Control
Authors: Deng Ke , Li Jinpeng , Wang Gang , Zhang Guangming , Bai Zhiqing , Lv Xiaodong 
Published: March 2023

Abstract
Facing the problem of having trouble building an exact mathematical model for aerodynamic heat simulation heating system (AHSHS), the conventional PID is considered to have the characteristics of simple operation, easy parameter adjustment, and high accuracy, but it is sensitive to external disturbances and has a poor anti-interference ability. In this paper, the fuzzy PID scheme for AHSHS is introduced to conquer the above problems. Firstly, the affiliation functions are constructed according to the system output errors and deviation variations. Next, the fuzzy rule table is designed, and the parameter autotune of PID is implemented utilizing both fuzzy inference and inverse fuzzification. Finally, comparative analysis through simulation verifies that the fuzzy PID scheme is more advantageous.
Influence of different testing positions of sensors on the dynamic response of load sensing hydraulic systems
Authors: Liu Jie , Wang Wei 
Published: March 2023

Abstract
This paper first introduced the load sensing hydraulic system and elaborated on its load feedback, pressure cut-off, and constant power control principles. Moreover, based on the response hysteresis of the load sensing hydraulic system in the actual commissioning of the project, this paper proposed the possible influence of the sensor on the response of the hydraulic system through troubleshooting analysis. Third, experiments were conducted to obtain the system dynamic response curves given different sensor positions and to prove the hypothesis. Meanwhile, the influence mechanism and improvement measures were analyzed. Finally, the optimal installation positions of the sensor based on different operating conditions were discussed.
Construction of the RMST Indicator System for Aeronautical Complex Equipment Based on Correlation Analysis and Fuzzy-rough Set Theory
Authors: Hu Gexi , Gong Feng , Liu Hengchang , Yao Fengming , Li Bo 
Published: March 2023

Abstract
To solve the problem of the lack of a scientific indicator system in the current RMST research of complex aeronautical equipment, we focused on the construction principle of science and followed the six principles, including objective, complete, workable, independent, significant, and dynamic. We have adopted subjective methods to collect the RMST of indicators in all aspects. Then the redundant indicators with large correlation coefficients were eliminated sequentially using correlation analysis, and the indicators that did not have a significant impact on the evaluation results were eliminated using fuzzy rough set theory. In order to avoid the redundancy of indicators while ensuring the retention of significant indicators, a scientific and concise RMST indicator system was finally constructed, which filled the gap of the current RMST indicator system for aeronautical complex equipment.
Relative Control Deployment Strategy of Continuous Low-thrust Satellites in Mage-constellation
Authors: Zhao Shuailong , Zhang Yasheng , Wang Yaru , Li Peng , XuanWang  
Published: March 2023

Abstract
The semimajor axis relative control strategy is mostly used in the deployment of mage-constellation satellites. This paper proposes the single orbit element relative control method and the multiple orbit elements relative control method. The first method accumulates the semimajor axis difference and the inclination difference in the time domain to generate the required difference at the Right Ascension of Ascending Node (RAAN) and calculates the mathematical limit to distinguish the high and low inclination when the energy consumption is the least. The second method uses the Hamilton function to deduce the motion characteristics of the satellite under continuous low-thrust, obtains the mathematical models of the optimal transfer of speed and inclination, speed and RAAN, and gives the continuous maneuver strategy of the small satellite. Finally, based on the TLE data of the Starlink satellite, an example is analyzed, and the two control strategies are simulated and compared. The simulation results show that the multi-orbit element simultaneous control is superior to the single-orbit element control in deployment efficiency, and the time cost is lower in engineering practice.
Long-lived Prptoplanetary disk Formation
Authors: Liu Xia , Xiao Lin , Zhang Li 
Published: March 2023

Abstract
Recently, protoplanetary disks around M dwarf stars have had longer ages than that typical protoplanetary disks. These long-lived protoplanetary disks imply that some protoplanetary disks suffer from a low-radiation. On the other hand, the host star’s masses around these protoplanetary disks are very low. We do not know whether long-lived protoplanetary disks can survive around stars with higher mass. In this work, we explore how protoplanetary disks lose their masses and how protoplanetary disk lifetimes dextral photoevaporation on host star mass. We find that only low-mass stars (< 0.5 M*) can host lone-lived protoplanetary disks (∼45 Myr). When star masses > 0.7 M*, the protoplanetary disk lifetimes drop below 45 Myr quickly because of the strong accretion and photoevaporation. The host stars with ∼2 M* may have protoplanetary disks with a lifetime of up to only 14 Myr. According to observations and our simulations, we consider that long-lived protoplanetary disks can only survive around M dwarf stars.
A Task Planning Algorithm for High-Mobility Satellites Based on Trajectory Splicing
Authors: Lu Meng , Fan Dongdong , Yu Linghui , Li Minghu 
Published: March 2023

Abstract
Natural disasters are global issues that have led to huge casualties and property losses. Satellite observation is one of the predominant methods of disaster monitoring, and high-mobility satellites can normally provide faster responses. A study of the high-mobility satellite task planning problem for global decentralized multi-target observation is conducted in this paper. First, a “trajectory-target” database composed of candidate trajectories and the corresponding visibilities of targets is established. Second, a splicing algorithm is devised to connect the individual trajectories as a whole so that the task planning problem can be converted to a combinational optimization problem of candidate trajectories. To solve the optimization problem, a heuristic algorithm is designed based on NSGA-II with a double-layer encoding structure and hybrid-heuristic mutation operators. The results presented at the end of the paper verify the effectiveness of the proposed algorithms.
Study on vibro-acoustic performance of composite laminates under transient impact excitation
Authors: Wang Hongfu , Guo Hanhui , Wang Yu , Du Yuan , Cai Wangqiu 
Published: March 2023

Abstract
With the widespread use of composite structures in ship superstructures, their vibro-acoustic response under transient impact loads is of increasing concern. This paper studies the vibro-acoustic behavior of a carbon fibre reinforced composite laminate under transient impact excitation based on the time-domain hybrid FEM/BEM method. Firstly, the numerical method is verified through the model test of a homogeneous plate. Subsequently, the vibration and sound radiation characteristics of composite laminates are studied. It was found that the impact noise energy mainly concentrated in the low-frequency range of 10~200Hz, and the peak noise spectrum was 9dB lower than that of the steel plate. The variation of lay-up orientations causes differences in the structural properties of the laminates, resulting in differences in their vibro-acoustic radiation performance. In this study, the laminate with the [0°/90°]5s orthogonal lay-up scheme has better acoustic radiation performance under the impact load.
Research on Acoustic Reflection Characteristics of Typical Concave Body based on COMSOL
Authors: Zhang Shisong , Sun Xiaofang , Yao Zhongshan 
Published: March 2023

Abstract
In the design of an underwater acoustic imaging system, to improve the signal-to-noise ratio (Snr) of the signal receiver and achieve good acoustic imaging results, it is necessary to discuss the acoustic focusing problem of the concave body. Based on COMSOL finite element analysis, this paper makes a comparative analysis of concave structures in several typical acoustic reflection modules, takes plane waves as the background sound field, analyses the acoustic reflection performance of typical concave structures at different wavelengths and angles of incidence, and studies the acoustic convergence effect under different concave structures, providing reference and help for further optimizing the design of acoustic imaging systems.
Study on vibro-acoustic characteristics of an adaptive piezoelectric locally resonant structure
Authors: Huang Anmin , Wang Minqing , Liao Daxiong , Guo Zhiwei 
Published: March 2023

Abstract
Adaptively reducing low-frequency broadband vibration and noise is a challenge in the engineering and needs to be resolved. A piezoelectric locally resonant structure with periodic piezoelectric units and shunt damping circuits of synthetic impedance was studied to provide an option to deal with the problem. The z-scores method was applied to identify the peak frequencies used in the setting of control parameters. The band-gap performance and vibro-acoustic response were analyzed based on the plane wave expansion method and finite element method, respectively. The results show that the considered locally resonant piezoelectric structure with the z-scores peak-detection method can adaptively suppress the vibration and acoustic radiation of the plate, providing an effective method to reduce vibration and noise in time-varying excitation situations.
Influence of the Spiral Angle of the Blade on the Material Loading Characteristics of the Slurry Pump
Authors: Chen Zhuyang , Yan Fei 
Published: March 2023

Abstract
To study the effect of rotational speed on the internal flow characteristics and operating performance of a deep-sea mining slurry pump, a new type of slurry pump delivery system with changing vane helix angle is adopted in this paper. Based on the coupled computational fluid dynamics-discrete element method (CFD-DEM), the realizable k-ɛturbulence model and SIMPLE algorithm are applied to numerically simulate the solid-liquid two-phase flow field in the slurry pump to study the effect of rotational speed on the flow characteristics and distribution of particles in the slurry pump. The results show that with the increase in rotational speed, the separation of the boundary layer at the impeller runner is promoted, which weakens the particle overflow capacity and increases the hydraulic loss. The impact at the inlet of the guide vane runner is more violent. The fluid flow separation at the inlet is suppressed. The overflow capacity is increased and the hydraulic loss is weakened. With the increase in rotational speed, the more the average number of collisions between particles and vanes in each time period, the more the particles collide with the impeller and space. The collision probability and collision speed of the guide vane overflow parts become larger, thus laterally reflecting that the larger the rotational speed, the greater the wear rate of particles on the blade is.
Dynamic Response Analysis of Suspended Tunnel under Wave-current Combined Action
Authors: Yan Songsong , Dou Peilin , Jing Baojin , Zhang Xiaoliu 
Published: March 2023

Abstract
The environment in the ocean is complex, and waves and currents produce complex coupling effects on the structures in the ocean. The flow-solid coupling theory and calculation method are applied to establish a three-dimensional model to study the changes in the flow field under the joint action of waves and currents through the comparative analysis of water velocity at the upper and lower near-wall surfaces of the suspension tunnel tube body. The dynamic response of the tension-leg suspension tunnel is calculated using unidirectional fluid-structure coupling. The relationship between different wave heights, different anchor angles, different flow velocities, and different depths and the deformation of the suspension tunnel in the presence of waves is investigated. The results show that the wave height and velocity have a great influence on the floating tunnel, and the displacement changes in both horizontal and vertical directions are large. With the increase of construction depth, the influence of waves on the floating tunnel becomes smaller. When the angle of the anchor cable is changed, the horizontal direction and the vertical direction change in opposite laws, so it is very important to select a suitable angle for the anchor cable. The research results provide a reference for the design of similar floating tunnels.
Directivity of spherical acoustic scattering based on COMSOL
Authors: Sun Xiaofang , Zhang Shisong , Yao Zhongshan 
Published: March 2023

Abstract
The acoustic scattering characteristics of spheres are the basis for studying the sound scattering law of the target. The directivity of acoustic scattering is one of the most important characteristics of the target sound scattering law. In this paper, the acoustic scattering characteristics of rigid spheres and elastic spherical shells are analyzed from the two typical basic models of the rigid sphere and elastic spherical shell. The sound scattering directivity corresponding to different ka values under different models is analyzed by COMSOL finite element simulation analysis. The change law of spheroid scattering directivity of spheres under different elastic backgrounds of the rigid sphere and elastic spherical shell is compared and studied. It is found that the scattering directivity of both rigid spheres and elastic spherical shells will change with the change of ka value. The larger the ka, the stronger the forward directivity, and the more side lobes for rigid spheres. The backward directivity is greater than the forward directivity at ka≤1, while the forward directivity of the elastic spherical shell is always greater than the backward direction. And it is not difficult to find that the directivity of rigid spheres is relatively uniform in backward scattering when ka=1. When ka>1, the directivity increases with ka, the forward directivity becomes stronger and stronger, and the side lobes gradually increase. The elastic spherical shell uses air as the internal filler, and its directivity has always been forward than backward. The forward directivity also increases with the increase of ka, and the side lobes also increase with the increase of frequency.
Tubing Depth Optimization Study of Horizontal Well Drainage and Gas Production in WeiYuan Shale Gas Field
Authors: Che Mingguang , Liu Jie , Bu Chengzhong , Dong Kai 
Published: March 2023

Abstract
Timely production with a tube in shale gas wells can effectively ensure the stable decline of gas wells. However, there is no in-depth study on which position of tubing is the most favorable for the stable production of gas wells and whether the wellbore trajectory has an impact on this position. To determine the reasonable end of tubing (EOT), firstly, through the gas water flow experiment of the whole wellbore test device of a horizontal well, the characteristics of liquid accumulation in the test section and the liquid discharge at the outlet are analyzed. The results show, when the horizontal section inclines upward and the end of the tubing reaches 1/3 of the horizontal section, the gas flow carrying liquid is the smallest. Then, OLGA software is used to simulate the wellbore effusion in the production process of gas wells with different tubing depths under different wellbore trajectories. The results show when the horizontal section inclines upward and the end of the tubing arrives at 1/3 of the horizontal section, the cumulative production of the gas well is the largest. Based on comprehensive analysis, it is most favorable for horizontal shale gas wells when the end of the tubing is about 1/3 of the horizontal section.