bluuebunny/crossref_metadata_2025_split huggingface dataset:
Symbiotic UCYN-A strains co-occurred with El Niño, relaxed upwelling, and varied eukaryotes over 10 years off Southern California
Authors: Fletcher-Hoppe Colette , Yeh Yi-Chun , Raut Yubin , Weissman J L , Fuhrman Jed A 
Published: June 2023

Abstract
Biological nitrogen fixation, the conversion of N2 gas into a bioavailable form, is vital to sustaining marine primary production. Studies have shifted beyond traditionally studied tropical diazotrophs. Candidatus Atelocyanobacterium thalassa (or UCYN-A) has emerged as a focal point due to its streamlined metabolism, intimate partnership with a haptophyte host, and broad distribution. Here, we explore the environmental parameters that govern UCYN-A’s presence at the San Pedro Ocean Time-series (SPOT), its host specificity, and statistically significant interactions with non-host eukaryotes from 2008-2018. 16S and 18S rRNA gene sequences were amplified by “universal primers” from monthly samples and resolved into Amplicon Sequence Variants, allowing us to observe multiple UCYN-A symbioses. UCYN-A1 relative abundances increased following the 2015-2016 El Niño event. This “open ocean ecotype” was present when coastal upwelling declined, and Ekman transport brought tropical waters into the region. Network analyses reveal all strains of UCYN-A co-occur with dinoflagellates including Lepidodinium, a potential predator, and parasitic Syndiniales. UCYN-A2 appeared to pair with multiple hosts and was not tightly coupled to its predominant host, while UCYN-A1 maintained a strong host-symbiont relationship. These biological relationships are particularly important to study in the context of climate change, which will alter UCYN-A distribution at regional and global scales.
Deep learning‐based panoptic segmentation: Recent advances and perspectives
Authors: Chuang Yuelong , Zhang Shiqing , Zhao Xiaoming 
Published: June 2023

AbstractIn recent years, panoptic segmentation has drawn increasing amounts of attention, leading to the rapid emergence of numerous related algorithms. A variety of deep neural networks have been used more frequently for panoptic segmentation, which is motivated by the significant success of deep learning methods in other tasks. This article presents a comprehensive exploration of panoptic segmentation, focusing on the analysis and understanding of RGB image data. Initially, the authors introduce the background of panoptic segmentation, including deep learning models and image segmentation. Then, the authors thoroughly cover a variety of panoptic segmentation‐related topics, such as datasets connected to the field, evaluation metrics, panoptic segmentation models, and derived subfields based on panoptic segmentation. Finally, the authors examine the difficulties and possibilities in this area and identify its future paths.
Orthogonal frequency‐division multiplexing‐based signal design for a dual‐function radar‐communications system using circulating code array
Authors: Zhou Yu , Ren Wen , Zhang Qiuyue , Chen Sisi , Zhang Linrang 
Published: June 2023

AbstractIn this study, a dual‐function radar‐communications (DFRC) system based on the circulating code array is presented to address the contradiction between radar and communications system in beam scanning and beam coverage. Processed orthogonal frequency‐division multiplexing (OFDM) signal is transmitted by the circulating code array as the base signal to improve the data rate. Following the spatial angle of the communication receiver, the communication symbols are modulated to part of OFDM signal subcarriers occupying a specific frequency band. A significant property of the circulating code array, which provides a relationship between the baseband frequency of the base signal and the spatial angles, implements a basis for safe telecommunication transmission towards the cooperative receiver and demodulation. Moreover, the circulating code array transmits the same signal and introduces the same time interval between adjacent array elements. Therefore, the complex problems of multi‐dimensional orthogonal signal design in the traditional multiple‐input‐multiple‐output‐based DFRC system design are transformed into a simple base signal design. Finally, an omnidirectional coverage pattern is obtained. Thus, whether the communication receiver is in the mainlobe or the sidelobe of the radar beam, the communication connection can be established between the designed DFRC system and the communication users. The performance of the described DFRC system is verified through theoretical analysis and simulations.
Epigenetics of Hypogonadotropic Hypogonadism: Molecular Mimicry between Severe Acute Respiratory Syndrome Coronavirus 2 and KISSR
Authors: Kanduc Darja 
Published: June 2023

AbstractThis study analyzed KISS1 and its receptor KISSR for peptide sharing with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It was found that SARS-CoV-2 shares numerous minimal immune pentapeptide determinants with KISSR only. The peptide sharing has a high immunologic potential since almost all the common peptides are present in 101 SARS-CoV-2-derived immunoreactive epitopes. Data are in favor of configuring molecular mimicry as an epigenetic factor that can alter KISSR thus causing the hypogonadotropic hypogonadism syndrome with which altered KISSR associates.
Research on double-variable EHA elevating and banlancing machine based on Matlab
Authors: Yang Weichao , Liu Fang , Lei Kaiwen , Wang Yuejin , Qu Wubin , Sun Yaodong , Fan He , Kou Yu 
Published: June 2023

Abstract
In order to improve the integration degree of traditional hydraulic pneumatic elevating and banlancing machine of artillery, solve the centralized energy of traditional hydraulic system and complex pipelines all over the vehicle body, and combine with electro-hydrostatic actuator (EHA) technology, a double variable elevating and banlancing machine based on EHA technology is designed, its system composition and working principle are introduced, its application characteristics in artillery are expounded, and the mathematical model of EHA elevating and banlancing machine is established. The force simulation of EHA elevating and banlancing machine system is carried out by using Matlab software. The simulation results show that the principle of the designed double-variable EHA elevating and banlancing machine system is correct, and its performance can meet the application requirements of artillery.
Angular rate enhanced Overload Controller Design for Low-speed UAVs
Authors: Yuansong Zhang , Zheng Gong , Zian Wang , Yongliang Chen 
Published: June 2023

Abstract
This paper investigates the overload controller for low-speed UAV maneuvering flight. Compared with high-speed and supersonic vehicles, low-speed UAVs are more sensitive to atmospheric disturbances during maneuvering and their signals are more sensitive. This paper combines UAV overload control theory and L1 adaptive theory to propose a longitudinal attitude control method based on overload control for low-speed UAVs. The method uses overload as the outer loop and pitch angle rate as the inner loop, and provides a reliable control scheme for maneuvering low-speed UAVs. Through simulation experiments, the controller proposed in this paper is compared with the conventional classical three-loop overload controller. The results show that the controller of this paper has faster angular rate response and stronger anti-interference capability under the same overload corresponding conditions.
Autonomous Following for Unmanned Ground Vehicles on Unstructured Scenario: Risk and Performance Assessment
Authors: Zhong Biqing , Liu Weihang , Zeng Riya , Guo Qiang , Jiang Haibo 
Published: June 2023

Abstract
Military unmanned ground vehicles are often used in wild natural environment, autonomous following and accompanying security are typical functions. In order to make a quantitative assessment about the autonomous following performance of unmanned ground vehicles on unstructured scenarios, a set of evaluation index system construction method is proposed based on the combination of risk analysis and key performance indexes. First, the kinematics model of autonomous vehicle following in straight and curve based on meta-trajectory is established. Second, the key indexes affecting the following performance are analyzed and obtained from collision risk and lost risk. Third, the evaluation index system of autonomous following performance is constructed from five dimensions: average following speed, collision risk, collision hazard degree, following stability and lost risk. Finally, two unmanned vehicles are tested, the results show that the conclusion based on the constructed evaluation index system can significantly reflect the difference of autonomous following performance, which is basically consistent with the subjective evaluation of the test personnel.
Lyapunov based global trajectory tracking control of wheeled mobile robot
Authors: Tao Zhao , Wang Yi-hua , Li Guang-qi , Hou Gang 
Published: June 2023

Abstract
This paper considers the global trajectory tracking control problem of wheeled mobile robot. A novel tracking controller for the kinematic model of wheeled mobile robot is presented based on the cascaded approach theory. Meanwhile, by using the Lyapunov stability theory, the stability of the controller is proved. Finally, the proposed scheme is implemented on the wheeled mobile robot. The simulation results show the effectiveness of the controller.
Research on fuzzy evaluation of combat effectiveness of small bore naval gun
Authors: Linhai Yao , Xiaodong Liang , Zechuan Zhang , Xiulin Yang , Yongan Yang , Jia Wang 
Published: June 2023

Abstract
In view of the fuzziness and uncertainty of the combat effectiveness evaluation index of small bore naval gun, combined with AHP and fuzzy evaluation method, the combat effectiveness evaluation method of small bore naval gun is studied. Firstly, the main influencing factors of the combat effectiveness of small bore naval gun are analyzed, and the index system of combat effectiveness evaluation is established. Then, based on AHP and fuzzy evaluation theory, a fuzzy evaluation model of small bore naval gun combat effectiveness is established. Finally, an example is given to evaluate the combat effectiveness of a small bore naval gun. This method can effectively unify the qualitative and quantitative indexes in the evaluation indexes, and provide an effective method and way for the combat effectiveness evaluation of small bore naval gun.
Joint estimation of DOA and coupling matrix based on linear prediction for small spacing antenna array
Authors: Huang Jiaqi , Liu Tong , Guo Jianming , Zhou Zenghao , Shan Yongzhi 
Published: June 2023

Abstract
A method for joint estimation of DOA and coupling matrix based on linear prediction is proposed for low resolution of mutual coupling calibration method in the case of small spacing antenna array. This method augments array aperture virtually according to linear prediction principle and calculates the coupling matrix by this virtual array. Then, this coupling matrix is used as the initialization matrix of joint estimation algorithm for coupling calibration. Simulation results confirm the effectiveness of the proposed method and provide the theoretical foundation for engineering realization. This method could also be applied in the field of tactical anti-jamming communication.
Modeling and simulation on dynamic engraving process of small caliber armor-piercing projectile with lead-free aluminum filler
Authors: Xu Hui , Zhang Ruijie , Liu Kun , Wu Zhilin 
Published: June 2023

Abstract
In order to reduce the ineffective armor-piercing weight of the small caliber armor-piercing projectile, improve combat effectiveness, and reduce the pollution of lead fillers to the environment, a projectile with aluminum filler was proposed. Taking the small caliber armor-piercing projectile as the research object, using explicit dynamic methods and coupling the classical internal ballistic equations, a numerical simulation model of bullet–barrel interactions during dynamic engraving process was established. And the reliability of the model was verified by the dynamic engraving experiment. Besides, using copper and copper-clad steel (CCS) as the jacket material, and aluminum and lead as the filler material, numerical simulation studies of four schemes were carried out. The result shows that, the aluminum filler projectile will cause a slight increase in the maximum chamber pressure and a slight decrease in the muzzle velocity of the projectile, an increase in the sliding friction force and a decrease in the maximum deformation force, an increase in the contact stress on both sides of the land and a decrease in the contact stress on the land and groove. And the contact stress on the non-driving side is larger than that on the driving side. The average contact stress and the engraving resistance of the Cu-Al case and CCS-Pb case are very close. And the application of Cu-Al projectile may improve the shooting accuracy in the hot barrel conditions compared with Cu-Pb projectile, and achieve the same performance as CCS-Pb projectile.
Multi-parameters study on underwater coil launch
Authors: Liu Ming-feng , Qin Tao-tao , Zhang Ying , Cai Ding-guo 
Published: June 2023

Abstract
The projectile launched by electromagnetic weapon has strong kinetic energy. In order to study the laws and characteristics of electromagnetic induction coilgun launching underwater, a multi-stage coilgun model was established in this paper. Based on the control variates method, the effects of trigger position, coil turns, capacitance value and other parameters on the launching process were studied, then the effects of above factors on the launching efficiency and exit speed were analyzed. The results show that the optimal trigger position offsets to the direction of the breech with the increase of the projectile speed; the optimal coil turns for a certain projectile and launching occurs when the trigger position is determined; the increase of the capacitance value can increase the exit speed of projectile, and the capacitance value should be selected according to the efficiency-speed curve when the launch efficiency is considered; the seawater resistance has little influence on the acceleration of the projectile, and comparatively large influence when there is no driving force. The research results of this paper can provide theoretical support for the manufacture of underwater coilgun prototype.
Numerical Simulation of Free Motion of Supercavitating Projectile with Tail Jet
Authors: Wang Jiawen , Qi Xiaobin , Wang Rui 
Published: June 2023

Abstract
In this paper, the flow field and trajectory of supercavitating projectile are calculated. Based on Fluent software, the axisymmetric calculation model is established, and the numerical simulation method of projectile underwater high-speed trajectory is established. Firstly, the simulation calculation of cavitation shape in the velocity range of 90m/s~190m/s is carried out, which is compared with the classical formula to verify the effectiveness of the calculation method. Then, the numerical simulation of the projectile in the water with initial velocity of 80m/s-130m/s is carried out. The numerical results show that when the engine is not ignited and the initial velocity is 90m/s, the projectile shows a “head up” navigation trend, and no complete supercavitation is formed at this time. In the velocity range of 100m/s-130m/s, the overall motion of the projectile shows a “bow” trend, the projectile is completely wrapped by cavitation, and the projectile does not collide with the cavitation wall. After the engine generates thrust, the maximum range can reach 70m under the action of this thrust.
Experimental investigation on air-breathing continuous rotating detonation engine in the cavity-based combustor
Authors: Cao Qi , Xiao Qiang 
Published: June 2023

Abstract
In order to broaden the stable working range of air-breathing continuous rotating detonation engine and explore the influence of combustor configuration on the propagation characteristics of rotating detonation wave, the cavity-based annular combustor is introduced. Air-breathing rotating detonation engine experiments are conducted with non-premixed ethylene and air. A tri-propellant air-heater is used to imitate the outlet parameters of the intake of Ma4/20km. The designed mass flow is 1kg/s and the total temperature is 860K. The results show that the self-sustaining rotating detonation wave cannot be formed in the conventional annular combustor. The self-sustaining propagation of detonation wave is realized at the equivalent ratio of 0.62 to 0.72 in the cavity-based combustor, and the propagation velocity of which is about 900 m/s. It is demonstrated that the vortex zone in the cavity is conducive to the formation of rotating detonation wave, which can effectively broaden the stable working range of the engine. Feasibility of cavity-based annular combustor in rotating detonation engine is validated.
Numerical Simulation of Cavitation and Hydrodynamic Characteristics of Supercavitating Projectiles in the Shear Flow
Authors: Yuan Xin , Zhao Zijie , Zhou Biaojun , Dai Qi 
Published: June 2023

Abstract
To investigate the cavitation and hydrodynamic characteristics of supercavitating projectiles in the shear flow, the Mixture multiphase and Schnerr-Sauer cavitation models are employed to simulate the underwater projectiles. The inflow average velocity is 600 m/s, and the shear rates range from 0 to 7500 s−1. In the uniform flow, the supercavity enveloping projectiles is vertically symmetrical. The drag is dominated by pressure drag, and the lift coefficient is 0. However, the supercavity is asymmetric in the shear flow, which deviates towards the low-speed side of projectiles. This is because the flow around projectiles runs faster on the high-speed side, and the vortices on the low-speed side entrain more fluid from the high-speed side. Thus, the projectiles suffer from normal shear stress orientating towards the low-speed side, and the lift coefficient turns negative. When the shear rate further increases, the projectile shoulder contacts water on the high-speed side, and the viscosity around projectiles is enhanced, resulting in the significant augmentation of the drag coefficient. As the water pressure is strongly larger than saturated vapor pressure on the low-speed side, the normal component of pressure acts more intensely towards the low-speed side of projectiles, and the lift coefficient is further decreased.
Terminal Ballistic Design of Guided Bomb in Rocket Sled Test
Authors: Yang Yang , Zhao Xiangwei , Liu Xianwei , Yang Yang 
Published: June 2023

Abstract
In order to meet the impact attack angle demand of 3°±1° of the guided bomb in the terminal effect rocket sled test, the dual-track rocket sled was designed as the research object, based on the simulation analysis of bomb-sled separation and factors that interfere with impact attack angle of the guided bomb. The terminal ballistic scheme was created with the guided bomb was preset to 2° and through 3m straight track, 6m curved track with a radius of 40m, 3m free flight, and the impact attack angle would be within the range of 2.12°~2.72°. In the test, impact attack angle of the guided bomb was 2.2°, which verifies the correctness of the design method.
Equivalent simulation test method for internal ballistics of fuze reserve chemical power source with adjustable combined overload and rotational speed
Authors: Li Shiwen , Wang Yingche , Chen Qin , Tian Yu , Xu Manjia , Wang Bo 
Published: June 2023

Abstract
To solve the problem that the test environment is not equivalent to the actual use environment in the step-by-step test method of fuze reserve chemical power supply, this paper proposes a fuze reserve chemical power source with an adjustable combination of overload and rotational speed by building a test platform to realize the synchronization of overload and rotational speed. In this method, compressed air and a rotary table were used to generate the flight power and rotational speed of the test tool, and then the overload and centrifugal force were controlled and loaded by the tool launcher and damping generator, and finally, the non-destructive recovery of the test tool was realized by the slow release mechanism. The test results showed that using the synchronous realization and controllable combination of overload and rotation, the internal ballistic equivalent simulation method could generate 3 000g ~ 30 000g overload, and the rotational speed of 0 ~ 18 000rpm could be synchronously controlled. The test results of the fuze power supply showed that the combination of overload and rotational speed could be controlled by this method. Under the same conditions, the overload repeatability reaches 95.5%, the rotational speed stability reaches 99.7%, and the equivalence with the medium and large-caliber inner ballistic environment is 91%. Therefore, through the test, the basic equivalent simulation of the ballistic environment in the fuze power supply has been realized.
The Study of Optimal Design for Interior Ballistics Based on the Reducing Barrel Erosion
Authors: Yuwei Wang , Wenfang Zhu , Qi Liu , Yancheng Dong 
Published: June 2023

Abstract
Aiming at the problem that the effect of barrel erosion is rarely used as a quantitative constraint in the past interior ballistic design process, the optimization design has been done for a large-caliber gun to improve the barrel life of gun and improve the performance of the interior ballistic, and the equivalent full charges (EFCs) is completed by combining different barrel erosion models with the interior ballistic model. The interior ballistic optimization design simulation represented by the minimization of barrel ablation has realized the optimization of the interior ballistic parameters with the reduction of barrel ablation as the constraint, and obtained the interior ballistic scheme that not only meets the interior ballistic performance indicators, but also helps to reduce the ablation of barrel. The research method formed can guide the design of low-ablation interior ballistic schemes for large-caliber gun, which plays an important role in improving the life of barrel.
Effect of ignition delay runaway of traveling charge on gun firing safety
Authors: Cao Yong-jie , Zhao Na , Ma Jia-jia , Hu Jie , Li Zhi-fei , Zhang Wang 
Published: June 2023

Abstract
In order to promote the engineering application of dense traveling charge technology, a structure scheme of dense traveling charge with central hole was proposed. Aiming at this scheme, the interior ballistic model was established, and the interior ballistic performance advantages of the new traveling charge scheme and the effect of inconsistent ignition delay time on the interior ballistic performance were analysed. The calculated results show that the central hole combustion traveling charge scheme is a feasible scheme. Compared with the end face burning traveling charge scheme, the burning rate of the traveling charge is reduced and the mass ratio of the traveling charge to the total charge is increased, which can effectively increase the muzzle velocity of the projectile and improve the performance of the gun. While the control precision of ignition delay time is at 0.01ms level, which puts forward higher requirements for the design and processing of the slow-burning layer. The ignition delay runaway of the traveling charge will have great influence on the interior ballistic performance of the gun, especially if the delay time is too small, it will cause premature ignition and combustion of traveling charge, resulting in high secondary pressure peak, which is not conducive to the safety of artillery launch. This study can provide guidance for the design of delayed ignition mechanism of traveling charge based on slow burning material.