bluuebunny/crossref_metadata_2025_split huggingface dataset:
Technical Research on Testing Content of Welded Column on Projectile
Authors: Li Qian , Wang Zhiping , Yang Qian , Liu Lin , Li Wenhao , Xi Xiaowen , Qi Xiaobin 
Published: May 2023

Abstract
Based on the assembly and inspection process of projectiles and rockets, this paper studies and analyzes the inspection link and content setting of welding and assembly on the projectile. Combined with the characteristics of the components, it proposes three aspects: inspection of the components, inspection before power-on screening, and pre-delivery inspection after final assembly. The research results of this paper can effectively verify the state of the projectiles and rockets after welding and assembly and improve the assembly quality of the productss.
Research on the sealed launching technology of underwater gun
Authors: Gu Yutao , Chen Xuejun , Wang Jiawen 
Published: May 2023

Abstract
With the progress of military technology, the underwater combat capability of the world’s major naval powers has developed rapidly. In order to effectively deal with the underwater threat, the related technology research of underwater gun is carried out based on supercavitation technology. Due to the particularity of underwater launch environment, the research of underwater gun launch technology still faces many problems. In this paper, the sealed launching technology of underwater gun is taken as the research object. By comparing with submerged launching and air curtain launching, the advantages of sealed launching technology of underwater gun are analyzed, and the muzzle sealing technology, sealed launching interior ballistic technology and continuous stable water entry technology of underwater gun are preliminarily studied. Opinions and suggestions are put forward for related technologies, which can provide reference for underwater gun launch technology research and engineering practice in the future.
Research on reverse design method of special shaped composite structure
Authors: Guo Jianfen , Xu Jingli , Luo Changhong , Zhang Haiyun , Zhang Jianqin , Qin Zhenming , Li Shuhu , Wang Danyong 
Published: May 2023

Abstract
It analysis and discuss the main procedures and their relativity of reverse design. Due to loss of original design data of a composite special-shaped structure, we start from the analysis of reverse design. According to the inner surface forming characteristics, we use the three-coordinate contact measurement to take the points and reverse design the shape, analyze and adjust the design surface to meet the requirements. The surface and solid of composite laminate are formed, and the production data is provided meeting the needs of rapid product development. We should reverse design the product from model analysis, and consider the processes of analysis-measurement-forming as a whole.
Numerical Simulation of the Influence of Interfacial Characteristics of Bulletproof Plates on Ballistic Protection Performance
Authors: Gao B , Peng G , Wang XC , Zhao H , Feng JC , Chen CX , Zhang B 
Published: May 2023

Abstract
The influence of three interfacial characteristics on the ballistic protection performance of double-layer steel plates is concluded through a numerical simulation of penetration of armor-piercing projectiles into double-layer steel plates with different interfacial characteristics. The research results show that the gap between double layers of steel plates has an adverse effect on the ballistic protection performance. The larger the gap is, the worse the ballistic protection performance is; appropriate interlaminar stress on double-layer steel plates can improve the ballistic protection of target plates; when the joint or fixed point of double-layer steel plates is too close to the impact point, the ballistic protection performance will demonstrate a downward trend.
Analysis Model for Damage of PBO Composite Laminate Target by High-Velocity Projectile Penetration
Authors: Chen CX , Wang XC , Peng G , Wang W , Gao B , Feng JC , Zhang B 
Published: May 2023

Abstract
Poly-p-phenylene benzobisoxazole (PBO) fiber is a new fiber with high ballistic performance, such as excellent heat and flame resistance and super mechanical properties. Consequently, increasing attention has been paid to its applications in the field of ballistic resistance. To identify the damage mechanism of PBO composite target caused by the high-velocity penetration of cylindrical projectiles and the energy conversion mode involved in the penetration process, this paper constructs a target damage engineering analysis model using the energy method in combination with stress wave propagation and projectile motion analysis. The residual velocity of the steel cylindrical projectile after perforating a PBO composite laminate is measured through ballistic tests, and it is compared with the value predicted by the analysis model. Comparison results show that the predicted value by the model is in good agreement with the measurement, with an error of less than 2.6%, thereby proving the validity of the constructed analysis model.
Research on The Damage Law of Reinforced Concrete Beams Caused by Cuboid Explosives under Contact Explosion
Authors: Yao H W , Jia X , Huang Z X , Yang C Z , Shang W 
Published: May 2023

Abstract
In order to study the damage law of cuboid explosives to reinforced concrete beams under contact explosion, the damage effect of reinforced concrete beams under the action of different length-to-width ratios, explosive heights and explosive equivalents of cuboid explosives is studied by LS-DYNA numerical simulation.The results show that when the amount of explosives and the height of explosives remain unchanged, and the ratio of length to width is 1:1, the volume of concrete damage is the largest. When the amount of explosives and the length-to-width ratio remain unchanged, the volume of concrete damage decreases with the increase in height. When the length-width-height ratio of the explosive is constant, the damage volume increases linearly with the increase of the explosive equivalent. The damage degree of beam is divided into three grades: Reinforced concrete beam is slightly damaged when the damage volume ratio is η <3%. Reinforced concrete beam is moderately damaged when the damage volume ratio is 3%< η <7%. Reinforced concrete beam is serious damaged when the damage volume ratio is η>7%.
Study of the Influence Factors for Ballistic Performance of Glass Fiber Reinforced Composites
Authors: Xu HM , Wang XB , Wang BC , Xue YJ , Qi YN , Kong LM 
Published: May 2023

Abstract
The study prepares glass fiber reinforced composites through Vacuum Assisted Resin Infusion (VARI) process, selects glass fibers of different specifications, and studies the effects of lay-up mode, thickness, simulated normal incident angle, and temperature of fiber composites s on their ballistic performance. Results show that with slimmer fiber monofilament, reinforced materials perform better in ballistics; the lay-up mode has limited influence on ballistic performance; the relationship between thickness and ballistic performance is positively linear; and the relationship between normal incident angle and ballistic performance is parabolic. Compared with room temperature conditions, the ballistic performance of composites does not decrease and even increases slightly under low temperatures. Yet, the performance decreases sharply at high temperatures.
Finite Element Analysis on the Anisotropic Characteristics of 3D Woven Resin Matrix Composites under Lateral Compression
Authors: Feng GY , Qu FZ , Wang XB , Wang BC , Xue YJ , Fu WQ 
Published: May 2023

Abstract
3D meso-structural composites with three layers were constructed using 3D modeling software Pro/E, and the static anisotropic characteristics of the composites under lateral compression in warp and weft directions were simulated by using finite element analysis software ANSYS. The mechanical properties of the composites under lateral compression were predicted by analyzing the stress and strain distribution of fiber and resin in the composites under lateral compression load. The anisotropic characteristics of composites were then analyzed. Results showed that the lateral compression property of the composites was anisotropic, and the lateral compression performance in weft direction was better than that in warp direction. In the composite, fiber bears more load, and the resin undergoes greater deformation. Fibers whose axial direction is parallel to the lateral compression direction bears greater load, while fibers whose axial direction is perpendicular to the lateral compression direction bears less load.
A Detection Method for Defects in Gun Barrel Made of Carbon Fiber/Ti Alloy Composites
Authors: Tang ZH , Sun LW , Jiang ZQ , Dong FX , Fan LM , Duan J , Sun Y , Zhao FB , Wang CK , Zheng SP , Chen Y 
Published: May 2023

Abstract
This study aims to explore the non-destructive detection method for such defects as debonding and delamination in carbon fiber/Ti alloy composite gun barrels during the preparation process. In this paper, the preparation method of composite barrel defective specimens is first introduced. Then water immersion ultrasonic testing and computed tomography (CT) scan are conducted for the specimens prepared. The results show that water immersion ultrasonic testing can identify the defects between the carbon fiber/Ti alloy layers, but CT scan fails to identify them. Therefore, immersion ultrasonic testing can be applied to the detection of defects between the carbon fiber/Ti alloy layers in composite gun barrels.
Properties of Special Polypropylene Fiber Grade Materials/Propylene-ethylene Copolymer Blends
Authors: Guo C , Liu W , Meng XY , Liu ZF , Zhang FB , Dai Y 
Published: May 2023

Abstract
Special propylene-ethylene copolymer (PEC) and polypropylene (PP) fiber grade materials were blended through the melt-compounding method to prepare the PP/PEC blends in varying proportions. Subsequently, further analysis was carried out on the crystallinity, dispersibility, mechanical properties and flexibility of the PP/PEC blends. The results haven shown that PEC is uniformly dispersed in the PP matrix, whereas the size of the PEC particle is relatively smaller. Moreover, as the content of PEC increases, the crystallization temperature of the PP/PEC blends (T
cp) would experience increases accordingly. In addition, the Young’s modulus and the tensile strength of the PP/PEC blends would experience decreases with evident increases in the impact strength. Last but not least, the softness of PP would experience increases to a certain extent with the addition of PEC.
Preparation and Properties of Broadband Terahertz Absorbing Coatings
Authors: Qiu GH , Wang W , Han JL , Zhang RR , Han L , Wang YK , Yu MX 
Published: May 2023

Abstract
This study designs and prepares broadband terahertz absorbing coatings. The electromagnetic simulation software is used to simulate and analyze the influence of permittivity, thickness of the coatings and incident angle of terahertz wave on the reflectivity of the absorption coatings within the range of 0.25 THz ~ 3 THz. Results show that as the real part of the dielectric constant and thickness increase, the low-reflection peak moves to lower frequencies. When the imaginary part of the dielectric constant and incident angle change, the intensity of the reflectivity peak changes relatively vastly. Terahertz absorption coatings with different thicknesses are prepared, and the reflectivity test results are consistent with the simulation results. The coatings have excellent absorption performance within the range of 0.25 THz ~ 3 THz, and the absorption exceeds 2.5 THz when the bandwidth is lower than -10dB.
Effect of Bubble and Void Defects on Properties of Structural Armor Composites
Authors: Wang BC , Wang XB , Xu HM , Fu WQ , Kong LM 
Published: May 2023

Abstract
The effect of bubbles and void defects on the properties of structural armor composite was investigated, and the properties of the composites repaired following the secondary infusion scheme were characterized. The results showed that bubbles could significantly decrease the mechanical properties of composites, the tensile strength and bending strength of the composites with bubbles were decreased by about 11% and 5% respectively, and the bending modulus of elasticity was 9% less. The ballistic performance of the composites with void defects was decreased. For V50, it was decreased by about 6%, and the specific energy absorption was reduced by about 9%. The void defect has little effect on the static mechanical properties of the composites, but will significantly reduce the anti-aging ability of the composites in hygrothermal environment. The mechanical properties and ballistic performance of the composites do not decrease significantly after the secondary infusion in the dry spot area.
Preparation and Performance of Carbon Nanotubes Reinforced Ultra-high Molecular Weight Polyethylene Fibre-based Composites
Authors: Liu FB , Li H , Wang RH , Xu JL , Li SH , Wang DY , Zhang HY , Zhang JQ , Jia HM , Liu Y , Gao YY 
Published: May 2023

Abstract
This study treated the surface of ultra-high molecular weight polyethylene (UHMWPE) fibres with plasma and optimized the parameters of plasma treatment. On this basis, UHMWPE fibre composites reinforced with carbon nanotubes (CNTs) were prepared, and the changes of UHMWPE fibres before and after modification in the chemical composition, surface morphology, and mechanical properties were studied. The results showed that oxygen-containing functional groups and active free radicals on the surface of plasma treated UHMWPE fibres increased. Tensile strength and modulus of UHMWPE fibre composites reinforced with CNTs increased by 16.3% and 21%.
Swarm Operation System and Its Intelligent Development
Authors: Zeyu Xu , Feng Hao , Yongzhou Wang , Yutong Bai 
Published: May 2023

Abstract
As a new operational pattern for the intelligent, unmanned, and networked battlefield in the future, swarm operation has become a research focus of all countries for its unique strengths and has been playing an increasingly important role in warfare. The origin and development trend of swarm operations are reviewed in this paper, to lay a foundation for future studies in this realm. Domestic and foreign development progress are summarized; representative swarm operation projects in the United States are introduced; and key technologies for intelligent swarm operations are analyzed for different operational missions.
Multidisciplinary design optimization for rapid revisit missile early warning constellation system
Authors: Mao Nengfeng , Long Teng , Shi Renhe , Wu Yufei , Ye Nianhui 
Published: May 2023

Abstract
In order to improve the comprehensive design performance of the missile early warning constellation system (MEWCS), the multidisciplinary design optimization (MDO) for rapid revisit MEWCS is studied. The MDO problem consists of orbit, coverage, attitude and orbit control, payload, power, and structure disciplines, which is formulated to minimize the revisit time subject to the constraints such as eclipse time, signal to noise ratio, and entire mass of satellite. To efficiently and effectively solve the studied MDO problem, a filter-based mode pursuing sampling intelligent exploring method using discriminative coordinate perturbation (FMPS-DCP) is used to obtain the optimized configuration of constellation and optimized parameters of satellite system. The engineering example shows that the revisit time of MEWCS for the target area is significantly reduced after optimization, which illustrates the effectiveness and practicality of the work in this paper.
Development and Application of Intelligent Test Data Management Platform of Military Product Model Project
Authors: Yang K , Peng Y L , He Y , Xu Y 
Published: May 2023

Abstract
This paper first introduces the composition of the intelligent test data management platform of military product model project, which has the functions of data file management, acquisition, tagging, pre-processing, archiving, intelligent analysis and judgement, etc. Then the software module design of the platform and the main functions of each module are described. Finally, the advantages of the platform, such as easy operation, practicability, expansibility, easy management, easy maintenance and intelligentization, and the problems that need to be optimized are discussed.
Development and Prospect of Intelligent Air-to-Ground Precision Strike Munition
Authors: Wenyuan Zhang , Sheng Luo , Jun Wang , Jian Zhou , Yanfang Cai 
Published: May 2023

Abstract
Intelligent munition, which integrates networking, big data, deep learning and other artificial intelligence (AI) technologies, is increasingly become the key to military reforms and combats in the future. Therefore, this study defines the connotations and features of intelligent air-to-ground precision strike munition, and provides an analysis on the development status and trend of such munition at home and abroad from the aspects of single intelligence and swarm intelligence. By drawing experience from the development of the U.S. army, this paper elaborates on the ways of establishing the technological system of intelligent air-to-ground precision strike munition from three aspects, namely, single intelligent technology, system integration and operational application. The study is expected to promote the research and development of the next generation of air-to-ground precision strike munition with intelligent features including perception, learning, decision-making and collaboration.
Discussion forum for the learning of Modern Physics in high school Mexico
Authors: Ramírez Díaz M. , Ávila García G. , Escobar Moreno F. 
Published: May 2023

Abstract
This research refers to the B-Learning educational model using the Moodle platform in the learning of Relativistic Physics as a complement to face-to-face classes in the high school modality, seeking mainly to stimulate the construction of the student’s own knowledge, oriented towards the autonomy of the student The activity was carried out through the implementation of a discussion forum with a sample of 20 high school students. The methodology is of a qualitative nature, which refers to the analysis of the data with the Atlas.ti platform, considering the nuclear variable of communication and the associated codes of significant interaction namely, guided didactic conversation, social interaction, open communication, simulated communication and discussion. The platform allows us to recognize the relevance of communication towards student learning through a discussion forum, that is confirmed through the correlations found between the codes. The results obtained through this analysis indicate the type of communication that students have when they participate in a forum for understanding the topic of Relativity, categorized with the codes, and that reveals the exchange that may or may not be significant about the content that is proposed in the discussion. Although more solid arguments are lacking among the students, the importance of communication as one of the competences of the 21st century is developed, and, above all, the close accompaniment of the teacher with recommendations and proposals for searching for information. In addition, the proposed evaluation allows the teacher to recognize the points where his contribution should be reinforced and, above all, lead to a self-assessment of the students.
Enhanced beam shifts mediated by bound states in continuum
Authors: Sinha Biswas Sounak , Remesh Ghanasyam , Achanta Venu Gopal , Banerjee Ayan , Ghosh Nirmalya , Dutta Gupta Subhasish 
Published: May 2023

Abstract
The interaction of light beams with resonant structures has led to the development of various optical platforms for sensing, particle manipulation, and strong light–matter interaction. In the current study, we investigate the manifestations of the bound states in continuum (BIC) on the in plane and out of plane shifts (referred to as Goos–Hänchen (GH) and Imbert–Fedorov (IF) shifts, respectively) of a finite beam with specific polarization incident at an arbitrary angle. Based on the angular spectrum decomposition, we develop a generic formalism for understanding the interaction of the finite beam with an arbitrary stratified medium with isotropic and homogeneous components. It is applied to the case of a Gaussian beam with p and circularly polarized light incident on a symmetric structure containing two polar dielectric layers separated by a spacer layer. For p-polarized plane wave incidence one of the coupled Berreman modes of the structure was recently shown to evolve to the bound state with infinite localization and diverging quality factor coexisting with the other mode with large radiation leakage (Remesh et al 2021 Opt. Commun.
498 127223). A small deviation from the ideal BIC resonance still offers resonances with very high quality factors and these are exploited in this study to report giant GH shifts. A notable enhancement in the IF shift for circularly polarized light is also shown. Moreover, the reflected beam is shown to undergo distortion leading to a satellite spot. The origin of such a splitting of the reflected beam is traced to a destructive interference due to the left and right halves of the corresponding spectra.
Fluid flow analysis of the lattice-based ceramic filters in molten metal filter application
Authors: Chouhan Ganesh , Bidare Prveen , Murali Gunji Bala , Pradhan Jitenjaya 
Published: May 2023

Abstract
The ceramic lattice filters are ideal for various technical applications, including filtration, flow stability, and heat transfer, that could alter the transport characteristics like pressure, permeability, and velocity. The authors presented a computational study based on the fluid flow parameters for four struts-based lattice structures in this work. This study includes seven designs of four struts-based lattice structures systematically created with 30 pores per inch (PPI) and 80% porosity while varying the unit cell sizes and strut diameter. The present computational study has been carried out using the turbulent k-epsilon (k-ε) model with the chosen metal alloy, IN718. The efficacy of the lattice filters has been determined by visualizing the physical parameters like pressure drop and velocity distribution patterns inside the filters. This study concludes that the BCC and the Diamond lattice structures have outperformed the other designs. Moreover, the effects of the variation in the unit cell and strut size have been evaluated for different structures and discussed.