bluuebunny/crossref_metadata_2025_split huggingface dataset:
Orthogonal Structure Design of the Linear Shaped Charge Based on Steady-State Velocity Model
Authors: Li Yishu , Zhai Zhe , Fan Xuefei , Han Hongwei , Zhao Yan , Cao Hequan 
Published: June 2023

Abstract
The velocity of the linear jet beams/slugs are one of the key factors affecting the penetration performance of the linear shaped charge (LSC). In order to obtain the velocity of the linear jet beams/slugs, we build the steady-state velocity model of the LSC first. Subsequent the LSC structures are designed by the orthogonal method based on the key factors of the LSC velocity model including the liner material, thickness, vertex angle, charge shape, explosive density, etc. The shape and velocity of the linear jet beams after the charge explosion are obtained by numerical simulation. Furthermore, X-ray tests are carried out to verify the simulation results. The average error of theoretical value, simulation and experimental result is less than 6%. The velocity model of the linear jet beams/slugs can guide the structural design of the LSC and play an important role in improving the penetration performance.
JUSMAR-MANS: a platform software for compressible multimedium flow large-scale numerical simulation on JASMIN framework
Authors: Yu Y Q , Liu N , Zhang P , Zhang A Q 
Published: June 2023

Abstract
A new platform software named JUSMAR-MANS based on JASMIN was developed for the massively parallel numerical simulation on compressible multimedia multiphase flow under complex conditions. Different from the traditional “chimney” program research and development (r&d) pattern, the MANS who adopted the “platform” r&d pattern provides a way by which the users can rapidly and conveniently customize personalized high-credibility program of multimedium without considering in numerical discrete and parallel computing. MANS has the following advantages: 1) Decoupling of disciplines: In architecture design, physical modeling, numerical discreting, parallel computing are separated from each other and concept shielding so that the high barriers of program r&d caused by interdisciplinary are broken down. 2) Expandability: enables to easily extend new physical models and numerical schemes based on single point/element interfaces. 3) Rapid customization: enable to quickly assemble personalized program based on various models and algorithms libraries integrated by MANS. Based on MANS, it only takes serial code within a few days to obtain a well-posed large - scale multimedium simulation, which greatly reduce the complexity of software r&d for compressible multimedium flow.
Research on Potential Equilibrium of Dynamic Combustion Performance in Electrothermal-Chemical Launching
Authors: Zong Sijia , Yang Chunxia 
Published: June 2023

Abstract
The interior ballistic potential equilibrium theory is used to analyse the parameters at the potential equilibrium points of pressure curves of 30mm conventional launching experiment and electrothermal-chemical (ETC) launching experiments. Analysis shows that: compared to the conventional launching experiment, (1) the time for ETC launching experiment to arrive the potential equilibrium point is apparently shortened; (2) the relative burnt percentages of the propellants at the potential equilibrium points are smaller in ETC launching tests. And the curves of gas generation brisance in the three ETC launching experiments are consistent. Then based on the measured pressure curves, the actual gas generation functions in chamber for conventional launching experiment and ETC launching experiments are fitted respectively. Using the average actual gas generation functions to replace the shape functions which are derived from the hypothesis of Geometric Combustion Law, the interior similarity equations of ETC Gun are established with the potential equilibrium point as the reference state. The calculated pressure curve obtained by solving the interior ballistic similarity equations of electrothermal chemical gun is in good agreement with the experimental pressure curve. Therefore, it is expected that the interior similarity equations of ETC Gun could predict the experimental pressure curve.
Experimental study on Hugoniot parameters of U71Mn steel under high pressure
Authors: Zhang Q D , Yan H D , Xie Z Z , Yu Y F 
Published: June 2023

Abstract
The Hugoniot parameters of U71Mn steel under high pressure were studied by hypervelocity impact test of U71Mn steel with two-stage light gas gun. The plate impact test of U71Mn steel sample was carried out by means of symmetrical impact. The minimum impact speed was 1.843km/s and the maximum impact speed was 5.018km/s. The Hugoniot relation and Hugoniot parameter C and λ, then the accuracy of Hugoniot parameters of U71Mn steel under high pressure is verified according to Hugoniot equation of state (the relationship curve between impact pressure and density). The research results can provide reference for the application of U71Mn steel in the field of hypervelocity impact.
High-power Microwave Damage Assessment Method for UAV
Authors: Yang Chong-Xiang , Cui Dong-Hua , Chen Zhi-Hua , Xiao Yu-Jie , Zheng Chun 
Published: June 2023

Abstract
To evaluate the damage assessment of high-power microwaves on complex electronic systems, a damage assessment method combining top-down system analysis and bottom-up comprehensive evaluation is proposed. A UAV damage tree model was constructed, and the FAHP-CRITIC method was used to assign weights to system components. The pulse energy transfer and coupling process are analyzed, and a neural network system is introduced to predict the damage degree of the parts considering the influencing factors of the damage degree of the parts. Based on the obtained component weights and damage degree, the system damage degree is calculated by the constructed nonlinear discontinuity function which satisfies the serial structure of the electronic system. Then, the mapping of system damage degree to ruin level is realized through the affiliation function. Finally, simulation calculations are carried out for the UAV to verify the feasibility and effectiveness of the proposed method.
Investigation on structural failure of filament reinforced barrel containment
Authors: Xiao Hongcheng , Ruxiang Li , Li Wei , Wang Junhao , Li Yingjie 
Published: June 2023

Abstract
During the launching process of a composite railgun, some working conditions may lead to the structure failure of its filament reinforced barrel. For instance, the instantaneous electric power impact caused by the unexpected large pulse current and surge from the pulse-forming network, which inspires the electrodynamic response beyond the safety limit of the barrel. More importantly, the alternating load after a long-term working causes damage accumulation and failure in the composite structure. For the railgun, considering that the radial deformation of the barrel has special effect on the contact state of the rail and armature in bore, it is necessary to focus on whether the radial stiffness of the barrel is affected even if the strength of the barrel does not decrease significantly by hidden injuries in the fiber wraps. In this study, based on the common used method of progressive failure theory, the radial stiffness attenuation process of the barrel is analyzed. The fiber fracture and composite delamination failure modes are found to be the main factors for radial stiffness attenuation of railgun barrel containment as persistent deformation will generate after these damage propagation. In addition, the loss of prestress in the fiber containment is evaluated based on structural analysis for the barrel in service and in manufacturing time. The research has found that optimized preloading seems important for improving the strength performance of the barrel.
Research on Evaluation Technology of Key Parameter Error Scheme for Medium and Long Range Suppression Artillery
Authors: Xiao-ke Gao , Ying-chao Wu 
Published: June 2023

Abstract
Aiming at the evaluation of the key parameter error scheme of medium and long-range suppression artillery, the evaluation index system is established, and the analytic hierarchy process of different evaluation index systems is constructed. In view of the complexity of the evaluation of the key parameter error scheme of the medium and long-range suppression artillery, a comprehensive evaluation scheme is constructed from three aspects: first, the evaluation method of the key parameter error method of the medium and long-range suppression artillery is determined, then the evaluation index system of the key parameter error scheme of the medium and long-range suppression artillery is designed, and finally the comprehensive evaluation model of the key parameter error is constructed. This paper studies the design principles of the evaluation index system of the key parameter error scheme of the medium and long-range suppression artillery, establishes a comprehensive evaluation index system, and comprehensively evaluates the key parameter error scheme based on AHP and ANP methods. Through the comprehensive evaluation of a group of error schemes, the effectiveness of the method is verified.
Research on key technology of complex components based on 3D printing
Authors: Liu D , Liu J B , Ren Y Q , Zhang Y T 
Published: June 2023

Abstract
3D printing technology as the advanced technology has developed rapidly in recent years. In order to study the problem of design and manufacture of gun complex components, applications of the muzzle brake with a high efficiency and low impact are of a special interest. This paper studied a number of key technologies of the complex components based on 3D printing, focusing on the discussion of the 3D model design, mold direction design, support structure design, 3D model layered slice and 3D printing process. The research for the improvement of the success rate of complex workpiece based on 3D printing has a good reference value, and expand the application of this technology in military field further.
Non-linear effective field theory simulators in two-fluid interfaces
Authors: Barroso Vitor S. , Bunney Cameron R. D. , Weinfurtner Silke 
Published: June 2023

Abstract
Analogue gravity offers an approach for testing the universality and robustness of quantum field theories in curved spacetimes and validating them using down-to-earth, laboratory-based experiments. Fluid interfaces are a promising framework for creating these gravity simulators and have successfully replicated phenomena such as Hawking radiation and black hole superradiance. Recent work has shown that hydrodynamical instabilities on the interface between two fluids can capture features of the post-inflationary thermalisation of the Early Universe. In this study, we extend fluid dynamics methods to develop an effective field theory for the interface between two fluids, demonstrating the equivalence between the governing equations and a relativistic scalar field in an analogue spacetime. We also show that the interfacial height field serves as the analogue relativistic field even in a nonlinear, interacting field theory. We propose that these mathematical equivalences can be extrapolated to probe regimes where calculations are challenging or impractical. Our work provides a new framework for simulating far-from-equilibrium cosmological and gravitational scenarios in the laboratory.
Hadamard and boundary conditions for the Big Bang quantum vacuum
Authors: Beltrán-Palau Pau , Nadal-Gisbert Sergi , Navarro-Salas José , Pla Silvia 
Published: June 2023

Abstract
General relativity predicts final-type singularities inside black holes, as well as a cosmological initial-type singularity. Cosmic censorship protects external observers from black hole singularities, while Penrose’s Weyl curvature hypothesis protects the smoothness of the initial (Big Bang) singularity. We discuss a simple realization of the Weyl curvature hypothesis by assuming a very early radiation-dominated universe and analytically extending the expansion factor to negative values of conformal time. We impose time-reversal conditions at the Big Bang to characterize a natural set of preferred vacuum states for quantized matter fields. We implement the prescription of States of Low Energy constructed around the Big Bang obtaining Hadamard states. We also explore the physical implications of these vacua for cosmological dark matter production.
Flow cytometry as an analytical method of drug-induced apoptosis in 3D bioprinted melanoma cells
Authors: de Villiers Maryke , Du Plessis Lissinda H 
Published: June 2023

Abstract
Three-dimensional (3D) cell culture systems have gained increasing interest in drug discovery and tissue engineering due to its inherent advantages in providing more physiologically relevant information and more predictive data for in vivo tests. Along with the development of more physiologically relevant 3D cell culture models, researchers bear the responsibility to validate new cell assay techniques capable of measuring and evaluating constructs that are physically larger and more complex compared to two-dimensional cell cultures. It is important to note that assays based on monolayer cultures may be insufficient for the use in 3D cell cultures models. In this study we firstly fabricated a 3D bioprinted hydrogel melanoma scaffold. This was used to validate a flow cytometry-based analytical method as a tool for 3D bioprinted structures to assess drug-induced apoptosis. The results indicated high robustness, reproducibility and sensitivity of the flow cytometric method established on the 3D cell-laden A375 melanoma hydrogel scaffolds. Over and above this, it was possible to determine the effect of etoposide on A375 melanoma cells using Annexin V and propidium iodide apoptosis assay.
Contrasting responses of the ocean’s oxygen minimum zones to artificial re-oxygenation
Authors: Beghoura Houda , Gorgues Thomas , Fransner Filippa , Auger Pierre-Amaël , Memery Laurent 
Published: June 2023

Abstract
Studies assessing potential measures to counteract the marine deoxygenation attributed to anthropogenic activities have been conducted in a few coastal environments and at regional scale, but not yet on a global scale. One way toward global scale artificial oxygenation would be to use oxygen produced as a by-product from hydrogen-production through electrolysis. The low-carbon footprint renewable production of hydrogen from offshore wind energy offers such a possibility. Here, we assessed the potential of this artificial oxygenation method on a global scale using a coupled physical-biogeochemical numerical model. The anthropogenic oxygen source scenario assumes worldwide adoption of hydrogen, considering demographic changes and the feasibility of offshore wind turbine deployment. Following this scenario, artificial oxygenation had a negligible effect on the overall oxygen inventory (an increase of 0.07%) but showed a reduction in the overall volume of Oxygen Minimum Zones (OMZs) between 1.1% and 2.4%. Despite the decrease in the mean OMZ volume globally, OMZs display distinct and contrasting regional patterns notably due to the oxygen impacts on the nitrogen cycle. Artificial oxygenation can inhibit denitrification resulting in a net gain of nitrate that promotes locally and remotely increased biological productivity and consequent respiration. Increased respiration could ultimately lead to an oxygen loss at and beyond injection sites as in the Tropical Pacific and Indian Ocean and particularly expand the Bay of Bengal OMZ. In contrast, the tropical OMZ shrinkage in the Atlantic Ocean is attributed to oxygen enrichment induced by advective transport into the OMZ, while the absence of denitrification in this area precludes any biochemical feedback effect on oxygen levels. These results suggest that the impacts of artificial oxygenation on oxygen concentrations and ecosystems are highly non-linear. It can produce unexpected regional responses that can occur beyond the injection sites which make them difficult to forecast.
Convergence of melt electrowriting and extrusion-based bioprinting for vascular patterning of a myocardial construct
Authors: Ainsworth Madison Jade , Chirico Nino , de Ruijter Mylène , Hrynevich Andrei , Dokter Inge , Sluijter Joost P G , Malda Jos , van Mil Alain , Castilho Miguel 
Published: June 2023

Abstract
To progress cardiac tissue engineering strategies closer to the clinic, thicker constructs are required to meet the functional need following a cardiac event. Consequently, pre-vascularization of these constructs needs to be investigated to ensure survival and optimal performance of implantable engineered heart tissue. The aim of this research is to investigate the potential of combining extrusion-based bioprinting (EBB) and melt electrowriting for the fabrication of a myocardial construct with a precisely patterned pre-vascular pathway. Gelatin methacryloyl (GelMA) was investigated as a base hydrogel for the respective myocardial and vascular bioinks with collagen, Matrigel and fibrinogen as interpenetrating polymers to support myocardial functionality. Subsequently, extrusion-based printability and viability were investigated to determine the optimal processing parameters for printing into melt electrowritten meshes. Finally, an anatomically inspired vascular pathway was implemented in a dual EBB set-up into melt electrowritten meshes, creating a patterned pre-vascularized myocardial construct. It was determined that a blend of 5% GelMA and 0.8 mg·ml−1 collagen with a low crosslinked density was optimal for myocardial cellular arrangement and alignment within the constructs. For the vascular fraction, the optimized formulation consisted of 5% GelMA, 0.8 mg·ml−1 collagen and 1 mg·ml−1 fibrinogen with a higher crosslinked density, which led to enhanced vascular cell connectivity. Printability assessment confirmed that the optimized bioinks could effectively fill the microfiber mesh while supporting cell viability (∼70%). Finally, the two bioinks were applied using a dual EBB system for the fabrication of a pre-vascular pathway with the shape of a left anterior descending artery within a myocardial construct, whereby the distinct cell populations could be visualized in their respective patterns up to D14. This research investigated the first step towards developing a thick engineered cardiac tissue construct in which a pre-vascularization pathway is fabricated within a myocardial construct.
Schottky barrier heights and electronic transport in Ga2O3 Schottky diodes
Authors: Kim Min-Yeong , Byun Dong-Wook , Lee Geon-Hee , Pookpanratana Sujitra , Li Qiliang , Koo Sang-Mo 
Published: June 2023

Abstract
The Schottky contact, formed at the interface between a metal and a semiconductor, is instrumental in defining the electrical properties of Schottky barrier diodes (SBDs). The characteristics of the Schottky contact are contingent on the properties of interacting metal and semiconductor properties. Herein, we studied the carrier-transport mechanisms and electrical characteristics at room and elevated temperatures. These SBDs employ pre-treated Ga2O3 thin films and either Ni or Au Schottky contacts. The SBDs pre-treated (pre-T) via annealing at 900 °C under an N2 atmosphere for the Ni contact showed highest on/off ratio at room temperature. They also demonstrated ideality factors and Schottky barrier heights (SBHs) that remained relatively stable between 298 K and 523 K. To ascertain the SBH, ideality factors (n) derived from the thermionic emission (TE) and thermionic field emission (TFE) models were used, and results were subsequently compared. Moreover, SBDs employing Ni as the anode material exhibited lower SBHs than those employing Au. The pre-T Ni SBD was best described by the TFE model, wherein the SBH and ideality factor varied by 0.14 eV and 0.13, respectively, between 298 K and 523 K. Conversely, for pre-T Au, untreated Ni, and untreated Au SBDs, neither TE and TFE provided a satisfactory fit due to the ideality factor is greater than 2 at room temperature and the variation of SBH and n with temperature. These suggests that the transport mechanism should be described by other physical mechanisms. Without pre-treatment, both the Ni and Au SBDs exhibited more significant variation in the SBH and n with temperature. SBHs values were determined using measurement of current, capacitance and x-ray photoelectron spectroscopy, and were found to depend on the interface quality, indicating inhomogeneous SBH. Our results suggest that the use of annealing pre-treatments and anode metals with low work functions holds considerable potential for reducing Schottky barrier heights in Schottky diodes, thereby enhancing their electrical performance.
Proposal for practical Rydberg quantum gates using a native two-photon excitation
Authors: Li Rui , Qian Jing , Zhang Weiping 
Published: June 2023

AbstractRydberg quantum gate serving as an indispensable computing unit for neutral-atom quantum computation, has attracted intense research efforts for the last decade. However, the state-of-the-art experiments have not reached the high gate fidelity as predicted by most theories due to the unexpected large loss remaining in Rydberg and intermediate states. In this paper, we report our findings in constructing a native two-qubit controlled-NOT gate based on pulse optimization. We focus on the method of commonly-used two-photon Rydberg excitation with smooth Gaussian-shaped pulses which is straightforward for experimental demonstration. By utilizing optimized pulse shapes the scheme reveals a remarkable reduction in the decays from Rydberg and intermediate states, as well as a high-tolerance to the residual thermal motion of atoms. We extract a conservative lower bound for the gate fidelity>0.9921after taking into account the experimental imperfections. Our results not only reduce the gap between experimental and theoretical prediction because of the optimal control, but also facilitate the connectivity of distant atomic qubits in a larger atom array by reducing the requirement of strong blockade, which is promising for developing multiqubit quantum computation in large-scale atomic arrays.
Ink engineering for slot-die coated perovskite solar cells and minimodules
Authors: Li Bowei , Zhang Wei 
Published: June 2023

Abstract
The power conversion efficiencies of perovskite solar cells (PSCs) have approached 26% for single-junction and 33% for multi-junction cells. Thus, various scalable depositions are studied to improve the manufacturability of PSCs for market entry. Of all types, slot-die coating is a promising technique thanks to its excellent compatibility with versatile systems. However, the complicated ink chemistry and film formation are major obstacles to scaling up devices. In this review, we systematically discuss ink engineering in the fabrication of slot-die-coated PSCs and perovskite minimodules, covering all functional layers that are processed using solution-based means. We then summarize a range of strategies to improve ink compatibility with slot-die coating, focusing on how to optimize the ink formulation to achieve high-quality films. Finally, we highlight the existing challenges and potential avenues for further development of slot-die-coated devices.