bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electronic structures and Aharonov–Bohm effect in higher-order topological Dirac Semimetal nanoribbons with strong confinements
Authors: Du Yan , Tang Shunxi , Tan Han , Liu Zhengfang , Wu Qingping , Zhou Xiaoying , Xiao Xianbo 
Published: June 2023

Abstract
Electronic structures and magnetotransport properties of topological Dirac semimetal (TDSM) nanoribbons are studied by adopting the tight-binding lattice model and the Landauer–Büttiker formula based on the non-equilibrium Green’s function. For concreteness, the TDSM material Cd3As2 grown along the experimentally accessible [110] crystallographic direction is taken as an example. We found that the electronic structures of the TDSM nanoribbon depend on both the strength and direction of the magnetic field (MF). The transversal local charge density (LCD) distribution of the electronic states in the TDSM nanoribbon is moved gradually from the center toward the hinge of each surface as a [010] direction MF strength is increased, forming the two-sided hinge states. However, one-sided surface states are generated in the TDSM nanoribbon when a [001] direction MF is applied. As a result, one-sided hinge states can be achieved once a tilted MF is placed to the TDSM nanoribbon. The underlying physical mechanism of the desired one-sided hinge states is attributed to both the orbital and Zeeman effects of the MF, which is given by analytical analyses. In addition, typical Aharonov–Bohm interference patterns are observed in the charge conductance of the two-terminal TDSM nanoribbon with a tilted MF. This conductance behaviour originates from the unique interfering loop shaped by the one-sided hinge states. These findings may not only further our understanding on the external-field-induced higher-order (HO) topological phases but also provide an alternative method to probe the HO boundary states.
Minimal port-based teleportation
Authors: Strelchuk Sergii , Studziński Michał 
Published: June 2023

Abstract
There are two types of port-based teleportation (PBT) protocols: deterministic—when the state always arrives to the receiver but is imperfectly transmitted and probabilistic—when the state reaches the receiver intact with high probability. We introduce the minimal set of requirements that define a feasible PBT protocol and construct a simple PBT protocol that satisfies these requirements: it teleports an unknown state of a qubit with success probability

p

succ

=
1
−

N
+
2

2

N
+
1

and fidelity

1
−
O
(

1
N

)

with the resource state consisting of N maximally entangled states. This protocol is not reducible from either the deterministic or probabilistic PBT protocol. We define the corresponding efficient superdense coding protocols which transmit more classical bits with fewer maximally entangled states. Furthermore, we introduce rigorous methods for comparing and converting between different PBT protocols.
Potential for Constraining Propagation Parameters of Galactic Cosmic Rays with the High Energy Cosmic-radiation Detection Facility on Board China’s Space Station
Authors: Xu Zhi-Hui , Yuan Qiang , Tang Zhi-Cheng , Bi Xiao-Jun 
Published: June 2023

Abstract
Precise measurements of the spectra of secondary and primary cosmic rays are crucial for understanding the origin and propagation of those energetic particles. The High Energy Cosmic-radiation Detection (HERD) facility on board China’s Space Station, which is expected to operate in 2027, will push the direct and precise measurements of cosmic-ray fluxes up to PeV energies. In this work, we investigate the potential of HERD for studying the propagation of cosmic rays using measurements of boron, carbon, and oxygen spectra. We find that, compared with the current results, the new HERD measurements can improve the accuracy of the propagation parameters by 8%–40%. The constraints on the injection spectra at high energies will also be improved.
Observation of the Semidiurnal Internal Tides in the Northwest Pacific Ocean
Authors: Xie Sihang , Jiang Yifei , Zhou Yong 
Published: June 2023

Abstract
Internal tides are internal waves occurring in the tidal frequency bands of stable stratified oceans, which are formed by the interaction between barotropic tides and different submarine topographical features such as ridges, sills, trough, trench and continental shelf break. In-depth study of tidal energy and tidal dynamics in this area is of great significance for understanding the multi-scale energy cascade structure in this ocean. Based on the 16-day mooring observation data of a set of high spatial and temporal resolution in the Northwest Pacific Ocean from 21°N to 22°N,124°E to 126°E, this paper reveals the amplitude distribution characteristics of the semidiurnal tidal wave in the northwest Pacific Ocean. The results show that the amplitude of the semidiurnal internal tides increases first and then decreases during the change of the depth from small to large. The amplitude is small at the surface and bottom of the ocean, and reaches the maximum at the middle of the ocean, with the maximum value of 40m
Analysis on Causes of the “4·21” Indonesian Submarine “Nanggala” Crash Based on Satellite Images
Authors: Chen J. , Bao S. L. , Wang H. Z. , Jin B. G. , Bai C. Z. , Kong X. J. , Li M. G. 
Published: June 2023

Abstract
In view of the “4·21” Indonesian submarine “Nanggala” crash event, an analysis of the marine environmental factors that may lead to the crash is carried out. The results show that the ocean internal wave is one possible cause of the disappearance of Indonesian submarines. The event is most likely that the submarine was subject to the so called “sea cliff” when encountering large-amplitude ocean internal waves, and at the same time, the officers and soldiers on board failed to take reasonable evasive measures in time, resulting in the submarine losing control and falling below the maximum safe diving depth, making the submarine crack under the pressure of the huge sea, resulting in a submarine accident. This conclusion is obtained based on the analysis of integrated ocean internal wave satellite images and numerical simulations.
The temporal and spatial distribution of sea fog in offshore of China based on FY-4A satellite data
Authors: Kong Xiaojuan , Jiang Zhuhui , Ma Ming , Chen Nan , Chen Jian , Shen Xiaojing , Bai Chengzu 
Published: June 2023

Abstract
Satellite remote sensing is an important instrument of sea fog monitoring. In order to study the temporal and spatial distribution characteristics of sea fog and the influence of sea surface temperature (SST) on the sea fog, based on sea fog monitoring and SST products from FY-4A satellite, the monthly variation of sea fog and monthly average SST in five typical sea areas (including Bohai Sea, Yellow Sea, East China Sea, Taiwan Strait and South China Sea) are statistically analyzed. The results show that the sea fog in offshore has strong regional and seasonal characteristics. From winter to autumn, the sea fog first appears in the Beibu Gulf of the South China Sea, the sea fog extends from South China Sea to East China Sea, and then to Yellow Sea, finally to Bohai Sea. Sea fog is related to sea surface temperature. By comparing the sea fog with the SST distribution, the optimal SST is from 7 °C to 25 °C when the sea fog happens.
Short-term Forecasting of Sea Ice Thickness Based on PredRNN++
Authors: Liu Quanhong , Zhang Ren , Wang Yangjun , Yan Hengqian , Xu Jing , Guo Yutong 
Published: June 2023

Abstract
The navigational potential of the Arctic shipping routes is gradually emerging under the trend of melting Arctic sea ice. However, the opening of the Arctic shipping routes still faces many difficulties, especially the complexity of sea ice changes and the navigational safety risks caused by the uncertainty of the sea ice forecast. In recent years, the deep learning method has emerged in sea ice forecasting due to its powerful non-linear fitting capability. In this paper, from the perspective of combining deep learning methods with expertise in meteorology and oceanography, an improved predictive recurrent neural network (PredRNN++) model is applied to sea ice thickness (SIT) forecasting for the first time. In this study, the short-term forecast (1-3 days) of SIT was realized, and the predictability was tested, confirming the effect of reasonable factor selection and screening on SIT forecasting.
Numerical Study on the Genesis of Incipient Vortex of a Tropical Storm over the South China Sea. Part I Control Simulation
Authors: Liu X , Yin T N , Hao S , Yao Z Y , Zhang Y 
Published: June 2023

Abstract
The previous work has found that strong sensible heating (SH) over the South China Sea (SCS) and western Pacific and related condensation latent heating (LH) are of great significance for the genesis and growth of the initial disturbance of Mindulle (2010). The Weather Research and Forecasting (WRF) model is used to simulate the genesis process of the storm Mindulle using grids nested to high resolution without bogusing. The numerical simulations are executed to determine the impact of the anomalous SH from the SCS on the incipient vortex of the storm formation, including the control-run with and the sensitivity-run without such heating. In the control simulation, the genesis process of the incipient vortex of Mindulle was reproduced along with the reasonable simulated SH over the SCS compared with the observations, which shows that the WRF model has an ability to simulate the formation process of tropical cyclones at the pre-WISHE stage without bogusing over the SCS basin.
Preliminary validation for an eddy-resolving Global Ocean Forecasting System –NMEFC-NEMO
Authors: Zhang Y , Mo H E , Zu Z Q , Qin Y H 
Published: June 2023

Abstract
This paper details the dynamical framework of the National Marine Environmental Forecasting Centre high-resolution global numerical ocean forecasting system (hereinafter referred to as NMEFC-NEMO) and provides a preliminary assessment of its simulation capability in the ocean climatic state. NMEFC-NEMO is developed based on the NEMO version 3.6 and the LIM version 3, and the Local Error Subspace Transform Kalman Filter (LESTKF) ensemble assimilation method is used. The preliminary climatic state assessment shows that the model can reproduce the temperature, salinity and current structure in the observational and reanalysis well, and the results of sea surface temperature and sea surface salinity are 0.05°C and 0.29 PSU colder and saltier, respectively, compared to WOA09. The difference of standard deviation for sea surface height is 0.027 compared to AVISO. We also find that the global mean salinity and kinetic energy of the NMEFC-NEMO are slightly larger in the upper layer relative to the other dataset, which could related to the model parameters setting or insufficient dynamic adjustment.
Three-Dimensional Thermohaline Structure Reconstruction in the Northwest Pacific Ocean from HY-2 Satellite Data Based on a Variational Method
Authors: He Zikang , Wu Xiangyu , Jin Baogang , Chen Zhiqiang , Liu Juan , Wang Zhaoyi 
Published: June 2023

Abstract
In this study, a variational method was used to reconstruct three-dimensional thermohaline fields in the Northwest Pacific Ocean. First, we evaluate the applicability of HY-2 satellite data in three-dimensional thermohaline fields reconstructions, and it confirms that the HY-2 data are reliable. A comparison with the forecast products of operational system shows the reconstructions can describe the structural characteristics of the ocean three-dimensional thermohaline fields and reflect the mesoscale change process of the ocean.
Anthropogenic Influences on the Hydrodynamic and Tidal Discharge in Tongzhou Bay, Nantong, China
Authors: Chen F. , Zhou G. H. , Kong J. 
Published: June 2023

Abstract
In this study, we determined the variations of tidal flow field and tidal prism caused by human activities in Tongzhou bay and using MIKE 21 hydrodynamic model as analyzing tool. After the human activities, the hydrodynamic in sea area alongshore engineering is changed, the most obvious changes can reach over 0.1m/s; the tidal discharge decreases caused by the land accretion leading to the shrink of the area of Nantong near-shore waters, there is up to 12% reduction after planned reclamation during one spring tide period.
A Marine Magnetometer Based on TMR
Authors: Li Z. B. , Du Q. F. , Zhang R. , Luo H. H. , Pan M. C. , Chen D. X. , Zhang Q. , Hu J. F. , Zhang J. S. 
Published: June 2023

Abstract
TMR (tunneling magnetoresistance) has the characteristics of high sensitivity, large linear range, low power consumption, and easy miniaturization, and has received great attention in the field of miniaturized and high-performance magnetic sensors. Widely used in marine magnetic field detection, earthquake monitoring, industrial control, and other fields. In this paper, A TMR marine magnetometer with AC modulation and magnetic field feedback compensation is proposed, designed, and manufactured, which can be used for the measurement of weak marine magnetic fields. After testing, its measurement range is ±100,000nT, the noise fluctuation level is 0.27nT, and nonlinearity level reaches 0.07%. It works by means of ac modulation and real-time compensation of feedback magnetic field, which greatly reduces magnetic hysteresis and increases the linearity. Compared with the nonlinearity of TMR material (more than 20% within ±1Oe, more than 7% within ±0.3Oe), it has been significantly improved.
Analysis of Influence of the Seamount in the South China Sea on Sound Propagation
Authors: Liu Yuyao , Li Lifan , Chen Yu , Chen Wei 
Published: June 2023

Abstract
The influence of seamounts on sound propagation is very important, and it is also a research hotspot for hydroacoustic. This paper uses the BELLHOP ray model to analyze the influence of seamounts in the South China Sea on sound propagation, it is found that the blocking of seamounts has a greater impact on the spatial distribution of the transmission loss. When forward propagation, the distribution of the transmission loss is mainly influenced by seamounts, and its temporal variation is not obvious. When the sound source is relatively far away from the first seamount, the first seamount does not have a great influence on the distribution of the transmission loss. When backward propagation, the transmission loss increases rapidly after passing through the first seamount. Most of the sound energy is blocked due to the higher height of the first seamount. In addition, the impact of the undulating bottom on the front of seamounts on sound propagation should also not be ignored during backward propagation. The seamount determines the most important characteristics of the transmission loss distribution, while the undulating bottom has a certain degree of influence on the distribution characteristics of some specific regions. The above results have important applications for target detection and hydroacoustic communication in the area of seamounts.
Research on magnetic anomaly detection method assisted by geomagnetic map
Authors: Yu Ziqiang , Pan Mengchun , Liu Zhongyan , Xu Yujing , You Guanjie , Zhang Qi 
Published: June 2023

Abstract
Magnetic anomaly detection is a detection technology for underwater/underground ferromagnetic targets. In the geomagnetic anomaly area, the change of magnetic feld is very complicated, and the detection ability of traditional detection methods will decline sharply. To solve this problem, we construct a high-precision local geomagnetic map, which turns geomagnetic anomalies into known prior information to assist detection. Firstly, the accuracy of local geomagnetic map is improved by the optimized variation function of interpolation algorithm and an efficient mapping strategy. Secondly, the magnetic target detector assisted by geomagnetic map is designed on basis of BP neural network and its internal structure is optimized. Finally, simulation and experiment were carried out. The results show that the method improves the detection performance in the geomagnetic anomaly area by 75%–80%, and well-adapted to low SNR situations. This proposed method makes the detection of geomagnetic anomaly are effective.
Vertical array signal recovery method based on normalized virtual time reversal mirror
Authors: Li P , Zhang X G , Zhang X Y , Liu Y 
Published: June 2023

Abstract
Focusing on the vertical array source signal recovery method, aiming at the estimation deviation caused by environment mismatch in the engineering application of virtual time reversal mirror technology, this paper proposes the normalized virtual time reversal technology through theoretical derivation and analyzes the performance of the virtual time reversal technology under the change of environment and signal-to-noise ratio through simulation. Finally, the practicability of the normalized virtual time reversal method and the effectiveness of model correction are verified through experimental data. The data processing results show that the source level estimation error of vertical array based on normalized virtual time reversal algorithm is less than 5.2dB. In the experimental environment of this paper, the correlation of signal spectral structure recovered by this method is about 5% higher than that by the traditional method.
Investigation on low-frequency sound propagation characteristics of fluid-filled steel pipeline
Authors: Song J , Li Q , Shang D 
Published: June 2023

Abstract
With the development of vibration reduction and noise reduction technology, the propeller noise, hydrodynamic noise and equipment base noise in submarines have been effectively suppressed. The sea pipeline system contains mechanical noise and fluid pulsation noise, which is one of the main noise sources of submarines. The fluid-filled steel pipeline is the basic component of the sea pipeline system. It is of great significance to study the low-frequency sound propagation characteristics of the fluid-filled steel pipeline system to effectively suppress the low-frequency noise of the pipeline system to the sea and achieve quiet submarines. At present, there are few studies on the sound propagation of fluid-filled steel pipeline, and most of them refer to gas-filled pipes. It is believed that there are low-frequency plane waves in the pipeline, which leads to the design of muffling devices only for liquids, the role of the pipe wall in the propagation of low-frequency sound is ignored. In this paper, according to the relationship between normal waves and medium wave velocity, a sound propagation model of fluid-filled steel pipeline is proposed, which is verified by experimental research. Through this model, the propagation path of low-frequency sound in the fluid-filled steel pipeline is clarified, which has an important guiding role in the vibration and noise reduction of the fluid-filled pipeline system.
Successive Interference Cancellation for Orthogonal Chirp Division Multiplexing
Authors: Liu Haoyang , He Chuanlin , Bai Yiqi , Liang Zhanyuan , Yin Jiawei , Sun Zhaocheng 
Published: June 2023

Abstract
In this paper, we propose a communication receivers’ architecture to simplify the Orthogonal Chirp Division Multiplexing (OCDM) channel equalization and to subtract multi-carrier interference followed by a successive interference cancellation (SIC) scheme in order to cancel the remaining interference. The interference introduced by underwater acoustic channel is estimated using a pre-acknowledged pilot symbol sequence, and then the interference can be optimally estimated and subtracted from the received signal. This process is repeated simultaneously for all OCDM carriers until a stationary point or a threshold is reached. Simulation results from Watermark are applied to illustrate the performance of the OCDM scheme with the presented successive interference cancellation algorithm. Results shows that the Bit Error Rate (BER) enhancement can reaches 102 in BCH1 channel. As expected, the combination of OCDM and presented SIC algorithm is shown to increase the output SNR over OCDM alone in multi-path shall water acoustic channel.
Effects of non-ideal seabed topography on low frequency sound propagation in shallow sea
Authors: Chai Z G , Wang Q L , Zhu H H , Cui Z Q , Tu H W 
Published: June 2023

Abstract
In order to study the influence of seabed topography on sound propagation under non-ideal conditions, a simulation model of low frequency sound propagation of whole waveguide is established by using finite element method (FEM). The action mechanism of the topography with seamounts on the components of the seismic wave field is studied in time domain. The simulation results show that the propagation of various seismic wave components can be seen intuitively from the time domain. Scholte waves can be excited easily in a suitable range from the seabed, and can propagate along the seabed for a long distance with small attenuation and strong stability. The presence of a seamount allows Scholte waves to scatter, and Scholte waves can travel along the surface of the seamount to the back of the seamount. The path and energy intensity of sound wave change with the change of terrain.
Directivity Research of Sensing Channels in a Distributed Fiber Optic Hydrophone
Authors: Li Wenmin , Lu Yang , Chen Yu , Liang Yan , Meng Zhou 
Published: June 2023

Abstract
An acoustic orientation method using the directivity of sensing channels in distributed fiber optic hydrophone (DFOH) is presented and demonstrated. Theoretical analysis shows that the sensing channel of DFOH is directional. Based on the directivity function of the channel, the direction of the acoustic signal can be obtained by scanning the length of the sensing channel, which is confirmed by experiments.
A Track-before-Detect Strategy for Multi-sensor Passive Acoustic Localization
Authors: Wang Yan , Li Xiang , Qi Bin , Li Shuo , Gao Yongshuai 
Published: June 2023

Abstract
This paper focuses on the multi-sensor passive acoustic localization problem. The traditional solution for the problem is to estimate the parameter of the received signal, such as the time difference of arrival (TDOA). Then the position of the target is solved by the estimated parameter. This solution is suboptimal because estimations are carried out at each sensor separately, and the fact that the received signals of different sensors originate from the same target is ignored. In this paper, we propose a track-before-detect (TBD) method. The proposed method adopts a particle filter that defines its likelihood function as the product of the output of the cross-correlation (CC) between the signal of different sensors conditioned on the particle’s state. This likelihood function is designed to ensure that the processing gain of multi-sensors can be fully obtained. Moreover, the proposed method circumvents the challenging measurement-to-track association problem faced by the method based on the estimated parameter.
A Low-cost Inertial Rail Track Positioning Technology Based on Distributed Optical System Assistance
Authors: Ge Mingming , Chen Xiyuan , Jiang Xuyang , Zhou Yunchuan 
Published: June 2023

Abstract
The low-cost MEMS inertial system is difficult to achieve high-precision measurement for path track, which decreases accuracy of output. Aiming at this problem, a distributed optical track assisted the low-cost inertial system scheme is proposed in this paper. Firstly, the positional relationship of the sub-modules is pre-calibrated on the test track. Secondly, the position and speed are calculated by processing the time difference of the photoelectric interruption. In this system, the low-cost MEMS inertial system is used to measure the attitude, speed, and position information. Subsequently, the data of the inertial system and the optical system are fused by the extended Kalman filter algorithm. To verify the feasibility of the scheme, a short rail speed measurement experimental platform is built in an indoor environment. Compared with the low-cost gyroscope, the result shows that the error divergence assisted by the optical system can be effectively suppressed. The positioning accuracy can reach the centimeter level in the results of the experiment.