bluuebunny/crossref_metadata_2025_split huggingface dataset:
Metal-insulator crossover in monolayer MoS2
Authors: Castillo I , Sohier T , Paillet M , Cakiroglu D , Consejo C , Wen C , Wasem Klein F , Zhao M-Q , Ouerghi A , Contreras S , Johnson A T Charlie , Verstraete M J , Jouault B , Nanot S 
Published: May 2023

Abstract
We report on transport measurements in monolayer MoS2 devices, close to the bottom of the conduction band edge. These devices were annealed in situ before electrical measurements. This allows us to obtain good ohmic contacts at low temperatures, and to measure precisely the conductivity and mobility via four-probe measurements. The measured effective mobility up to μ
eff = 180 cm2 V−1 s−1 is among the largest obtained in CVD-grown MoS2 monolayer devices. These measurements show that electronic transport is of the insulating type for σ ≤ 1.4e
2/h and n ≤ 1.7 × 1012 cm−2, and a crossover to a metallic regime is observed above those values. In the insulating regime, thermally activated transport dominates at high temperature (T > 120 K). At lower temperatures, conductivity is driven by Efros–Schklovkii variable range hopping in all measured devices, with a universal and constant hopping prefactor, that is a clear indication that hopping is not phonon-mediated. At higher carrier density, and high temperature, the conductivity is well modeled by the Boltzmann equation for a non-interacting Fermi gas, taking into account both phonon and impurity scatterings. Finally, even if this apparent metal-insulator transition can be explained by phonon-related phenomena at high temperature, the possibility of a genuine 2D MIT cannot be ruled out, as we can observe a clear power-law diverging localization length close to the transition, and a one-parameter scaling can be realized.
Trap-assisted enhancement of the responsivity in asymmetric planar GaN-based nanodiodes at low temperature
Authors: Pérez-Martín E , Sánchez-Martín H , González T , Mateos J , Íñiguez-de-la-Torre I 
Published: May 2023

Abstract
The microwave detection capability of GaN-based asymmetric planar nanodiodes (so-called Self-Switching Diode, SSD, due to its non-linearity) has been characterized in a wide temperature range, from 70 K up to 300 K. At low temperature, microwave measurements reveal an enhancement of the responsivity at frequencies below 1 GHz, which, together with a pronounced hysteresis in the DC curves, indicate a significant influence of the surface states. This leads to a significant variability and non-repeatability which needs to be reduced since it degrades the accuracy of the detection. For this sake, the RF characterization was repeated after applying a positive/negative voltage able to fill/empty the surface states in order to have a well-established preconditioned state. As a consequence of the positive pre-soak bias, a significant enhancement of the measured responsivity, with a × 10 increase at low temperature. The RF detection measurements after such preconditioning contains a time dependence induced by the slow discharge mechanism of the traps, so that the improved responsivity remains even after 100s of seconds. On the other hand, a negative voltage pre-soak benefits the discharge process, thus suppressing the low frequency dispersion and the important variability of the detection without the pre-conditioning step. We also show that the relation between the voltage and current responsivities in each case allows to explain the impact of the surface charges in terms of the device impedance.
Evaluating the effect of setup uncertainty reduction and adaptation to geometric changes on normal tissue complication probability using online adaptive head and neck intensity modulated proton therapy
Authors: Lalonde Arthur , Bobić Mislav , Sharp Gregory C , Chamseddine Ibrahim , Winey Brian , Paganetti Harald 
Published: May 2023

Abstract

Objective. To evaluate the impact of setup uncertainty reduction (SUR) and adaptation to geometrical changes (AGC) on normal tissue complication probability (NTCP) when using online adaptive head and neck intensity modulated proton therapy (IMPT). Approach. A cohort of ten retrospective head and neck cancer patients with daily scatter corrected cone-beam CT (CBCT) was studied. For each patient, two IMPT treatment plans were created: one with a 3 mm setup uncertainty robustness setting and one with no explicit setup robustness. Both plans were recalculated on the daily CBCT considering three scenarios: the robust plan without adaptation, the non-robust plan without adaptation and the non-robust plan with daily online adaptation. Online-adaptation was simulated using an in-house developed workflow based on GPU-accelerated Monte Carlo dose calculation and partial spot-intensity re-optimization. Dose distributions associated with each scenario were accumulated on the planning CT, where NTCP models for six toxicities were applied. NTCP values from each scenario were intercompared to quantify the reduction in toxicity risk induced by SUR alone, AGC alone and SUR and AGC combined. Finally, a decision tree was implemented to assess the clinical significance of the toxicity reduction associated with each mechanism. Main results. For most patients, clinically meaningful NTCP reductions were only achieved when SUR and AGC were performed together. In these conditions, total reductions in NTCP of up to 30.48 pp were obtained, with noticeable NTCP reductions for aspiration, dysphagia and xerostomia (mean reductions of 8.25, 5.42 and 5.12 pp respectively). While SUR had a generally larger impact than AGC on NTCP reductions, SUR alone did not induce clinically meaningful toxicity reductions in any patient, compared to only one for AGC alone. Significance Online adaptive head and neck proton therapy can only yield clinically significant reductions in the risk of long-term side effects when combining the benefits of SUR and AGC.
Altered the structural, morphological and optical properties of SbSe thin films through swift heavy ion irradiation
Authors: Singh Harpreet , Singh Palwinder , Singh Kamaljit , Singh Fouran , Pratap Singh Abhinav , Kumar Akshay , Thakur Anup 
Published: May 2023

Abstract
Chalcogenide based phase change materials are gaining attention due to their ability to exhibit expeditious and reversible structural transition from amorphous to crystalline phase. This work included the effect of swift heavy silver (Ag9+) ion-irradiation (120 MeV), at various fluences (5E11, 1E12, 5E12 and 1E13 ions/cm2) on the structural, optical and morphological properties of pristine and annealed (250 ° C) SbSe thin films. The pristine films undergo a structural transition from amorphous to crystalline upon annealing and from crystalline to amorphous upon irradiation of annealed films. Structural transition caused by annealing and ion-irradiation resulted in a drastic change in morphology and optical properties. The annealed films exhibited less transmission than the pristine and irradiated films, which increased with increase in ion-irradiation fluences because of phase transition. After irradiation, the optical band decreased for pristine thin films, because the forbidden gap defect concentration has increased, but increased after irradiating the annealed thin films that may be due to annealing out of dense localized defect states. The significant optical contrast upon phase transition in near infrared region can be utilized for different optoelectronic applications.
Quantification of the robustness of functional neural networks: application to the characterization of Alzheimer’s disease continuum
Authors: Revilla-Vallejo Marcos , Gómez Carlos , Gomez-Pilar Javier , Hornero Roberto , Ángel Tola-Arribas Miguel , Cano Mónica , Shigihara Yoshihito , Hoshi Hideyuki , Poza Jesús 
Published: May 2023

Abstract

Objective. Brain connectivity networks are usually characterized in terms of properties coming from the complex network theory. Using new measures to summarize the attributes of functional connectivity networks can be an important step for their better understanding and characterization, as well as to comprehend the alterations associated with neuropsychiatric and neurodegenerative disorders. In this context, the main objective of this study was to introduce a novel methodology to evaluate network robustness, which was subsequently applied to characterize the brain activity in the Alzheimer’s disease (AD) continuum. Approach. Functional connectivity networks were built using 478 electroencephalographic and magnetoencephalographic resting-state recordings from three different databases. These functional connectivity networks computed in the conventional frequency bands were modified simulating an iterative attack procedure using six different strategies. The network changes caused by these attacks were evaluated by means of Spearman’s correlation. The obtained results at the conventional frequency bands were aggregated in a correlation surface, which was characterized in terms of four gradient distribution properties: mean, variance, skewness, and kurtosis. Main results. The new proposed methodology was able to consistently quantify network robustness. Our results showed statistically significant differences in the inherent ability of the network to deal with attacks (i.e. differences in network robustness) between controls, mild cognitive impairment subjects, and AD patients for the three different databases. In addition, we found a significant correlation between mini-mental state examination scores and the changes in network robustness. Significance. To the best of our knowledge, this is the first study which assesses the robustness of the functional connectivity network in the AD continuum. Our findings consistently evidence the loss of network robustness as the AD progresses for the three databases. Furthermore, the changes in this complex network property may be related with the progressive deterioration in brain functioning due to AD.
Research on Dynamic Gunnery Problem Solution Based on Exterior Ballistic
Authors: Li Rui , Zhang Long , Lu Yu-xiang , Wang Yu 
Published: May 2023

Abstract
Abstract:In order to solve the problem of dynamic gunnery problem solution under fire maneuver condition, this paper proposes a method of hitting the moving targets with rapid fire in the maneuver weapon. Based on the exterior ballistics model, objective model, the dynamic gunnery problem solution model is established. The improved particle swarm optimization (PSO) is adopted to calculate the ballistic data. In the process of realizing the algorithm, the angle of firing, azimuth and flight time of projectile are calculated iteratively synchronously, so as to improve the efficiency of the solution by eliminating the initial time assignment step. Considering the sustained rapid fire of maneuver weapon, the adjusting parameters of fire control elements for dynamic shooting are provided by solving the first and last firing ballistic data. The feasibility of the algorithm is verified by simulation experiment.
The Reliability Optimization of a ShipborneDevice by Surrogate Modelling
Authors: Li YD , Wang W , Wang JW , Cao ZC , Kang ZK 
Published: May 2023

Abstract
A Shipborne Weapon Device is not only affected by repetitive and low tense bumping impact, but also warship swing and tilt caused by sea wind and wave. To study on the influences in warship mechanical environment on working reliability of shipborne weapon device, the positioning accuracy of a large caliber naval gun rotary magazine is researched. A automated simulation process is carried out in a multidisciplinary design environment. A more accurate surrogate modelling is first set up based on design of experiments technique, and reliability design and optimization are established sequentially, the positioning accuracy reliability of the rotary magazine is increased from 50.2% to 99.3%. In experimental testing phase, the simulation model is verified and corrected based on test data, and the simulation accuracy is ensured, and test limitations are compensated by simulation in addition. This method can promote the work reliability of similar shipborne devices in warship complicated working conditions.
Effect of Initial Loading Position on the Propellant Particles Distribution in Two-module Charge
Authors: Chen A , Yu Y G 
Published: May 2023

Abstract
The propellant particles distribution in the ignition process of the modular charge has a significant effect on the interior ballistic stability. Thereinto, the particles final distribution is determined by the particles motion process. Based on the CFD-DEM method, a 3D transient gas-solid flow model is constructed to investigate the motion process and the dispersion of propellant particles. Moreover, the cold state test of the ignition process of modular charge is accomplished based on a visual ignition test platform. The simulated data are consistent with the test one. Furthermore, the effect of the initial loading position on the propellant particles distribution of two-module charge is predicted by the numerical simulation. All of two-module cases show that the distributions of particles are made up of a gentle-downhill, a horizontal, and a steep-uphill accumulation. As the initial loading position of modules moves to the right, the slope angle of the uphill is decreased first and then increased, with the minimum slope angle of 20.5°. When the initial loading position of modules is 40mm, the spatial distribution gradient of particles gets the minimum in the uphill accumulation area, and the particles axial-distribution is the most uniform.
Research on spin reduction mechanism of the projectile sliding belt in bore
Authors: Peng J C , Jiang J W , Kang H B , Liao W 
Published: May 2023

Abstract
The sliding belt assembly plays a key role in spin reduction to protect the electronic components and smoothly control the projectile posture. The complete guided projectile motion in the bore was reproduced by LS-DYNA software, where the gunpowder pressure was loaded on the projectile bottom. The dynamic parameters of the projectile obtained by simulation agree well with the test, including the axial velocity, acceleration and rotation speed. Great spin reduction occurs in the bore by the sliding belt assembly, which is indicated by the rotation speed and the motion of the sliding belt and projectile, respectively. From the interaction of the belt assembly at typical times, it is the escaping from the bases periodically of the belt ring so that greatly spin reduction of the projectile body is achieved.
Modeling and Simulation of Hydraulic Buffer in the Gatling Gun
Authors: Liu D , Wang ZX , Shen YL , Meng C , Zhang SM , Li Y 
Published: May 2023

Abstract
For the gatling weapon, due to its high firing rate and the complex characteristics of recoil, reducing the recoil resistance and enhancing firing precision becomes an important research topic for the improvement of the performance of gatling weapon system. In this paper, a spring-hydraulic floating buffer device was designed as the whole gun buffer. Based on the computational fluid dynamics numerical analysis method, a calculation model of the hydraulic buffer in the gun was established. ADAMS was used to simulate the buffer, and the recoil force of automata was obtained. By comparing the simulation results with the actual test results, the correctness of the calculation and simulation methods is verified, and a technical route combining simulation calculation and test is obtained, which lays a foundation for the practical engineering application and the hydraulic buffer design.
Study on Gliding Extended Range Ballistics of Long-Range Guided Mortar Projectiles
Authors: Shengzheng Chen , Yuhang Song , Boyi Kang , Qingshan Du 
Published: May 2023

Abstract
This paper endeavors to discuss the long-range guided mortar projectile scheme and the gliding extended range ballistics design. Starting from the glide extended range ballistic kinematics equation, analysis results show that the lift-drag ratio and the maximum ballistic height are the two most important factors affecting the gliding capability of guided mortar projectiles. This conclusion, verified by simulation analysis, is expected to provide certain guidance for the overall design of the long-range guided mortar munition.
Molecular dynamics simulation of the gun barrel material erosion by propellant gas
Authors: Dong X Q , Chen A 
Published: May 2023

Abstract
The mechanisms of propellant gas chemical erosion on gun barrel materials are discussed creatively from a microscopic perspective of molecular diffusion and intermolecular interaction. The influence of high-temperature and high-pressure propellant gas atoms on the shallow surface microstructure of the barrel material is theoretically analyzed using the molecular dynamics simulation method, which can be used as a new idea for further study of the gun barrel erosion mechanism. The results show that the diffusion of the propellant gas atoms into the barrel material can be characterized by the significant longitudinal distribution characteristics of propellant gas atoms and the normal stress distribution characteristics in the surface layer of the barrel. Moreover, the diffusion ability of the propellant gas atoms in the surface of the barrel material decreases gradually with the increasing diffusion depth. Under the action of propellant gas atoms, the dislocation structure dominated by face-centered cubic structure (FCC) forms in the shallow surface of the barrel material. The production of initial erosion in the shallow surface of barrel materials can be predicted by the continual growth of the new structure and the stress distribution characteristics of the material. In addition, the temperature variation of the propellant gas contributes significantly to barrel material erosion.
Research on optimization of aiming point of sub cluster anti-airport runway based on particle swarm optimization algorithm
Authors: Liu Yunhui , Zhu Peng , Yan Jundan , Zhang Wei , Ma Qingyue , Hu Longbing , Weixiang Zhang 
Published: May 2023

Abstract
A particle swarm optimization algorithm is proposed in this study to optimize the fire distribution, so as to solve the fire distribution problem of cluster warhead anti-airport runway. The particle swarm optimization fitness function is built based on the calculation model of cluster warhead anti-airport runway blocking probability using the Monte Carlo method, and the optimal cluster warhead aiming point allocation scheme is obtained using the particle swarm optimization algorithm. Moreover, the feasibility and advantages of the algorithm are compared and analyzed in the case of different size airports and different number of submunitions. The results provide a reference for the formulation of operational scheme when the cluster bomb strikes the airport runway.
Ballistic Simulation and Analysis of Turntable Rotation on the Flight Stability of Anti-aircraft Rocket
Authors: Jiang M , Zhang ZY , Li Y , Liu YW 
Published: May 2023

Abstract
The air defense multiple launch rocket is an effective terminal air defense weapon. The rotation of its turntable has an effect on the rocket’s ballistic. In the paper, the rotation angular velocity of the turntable is combined into the initial swing angular velocity of the transverse and longitudinal axis of the projectile axis. Based on this, taking the rotation of the turntable in the direction as an example, the six-degree-of-freedom rigid body ballistic model is selected for full ballistic simulation, and the stability of the projectile flight at different rotation angular velocities is studied according to the simulation results of the rocket attitude angle.
Research on Artillery Firing Trajectory under the Condition of Extra-large Elevation Difference between Artillery and Target in Plateau Area
Authors: Duan Yanan , Liu Yuwen , Cheng Yan , Jiang Ming , Zhang Zhiyuan 
Published: May 2023

Abstract
Get the influence of shooting on the ballistic elements and correction elements of grenade under the condition of extra-large elevation difference between artillery and target in plateau area through simulation, and drawn the comparison chart of different altitude and elevation difference between artillery and target by using the simulation data. Calculate the variation characteristics of the hit range of laser terminal guided projectile under the condition of the elevation difference of extra-large elevation difference between artillery and target at different altitudes, and the influence of altitude and extra-large elevation difference between artillery and target on the hit range of laser terminal guided projectile is analyzed and summarized. It has a certain reference value for improving the shooting accuracy under the condition of high altitude and extra-large elevation difference between artillery and target.
Study on Dynamic Pressure Control of Air-Breathing Hypersonic Vehicle
Authors: Ma Q H , Pan R , Li J P , Deng H P 
Published: May 2023

Abstract
To satisfy the strict requirements of dynamic pressure for air-breathing hypersonic vehicle during the initiation, a dynamic pressure control method based on the model reference sliding mode theory is designed. Firstly, the motion equation of the air-breathing hypersonic vehicle is built, and the dynamic pressure linearization model is established by the small perturbation method. Secondly, the control system, designed by the model reference sliding mode control theory, can quickly track the reference model. Finally, the six degrees of freedom simulation model is built and used for digital simulation. The simulation results show that the designed control system can accurately track the dynamic pressure command with great robustness.
Design of Long-Stroke ejector with Traveling Charge Structure
Authors: Jing Li , Chen Jin , Yang Zhao , Jia Zinian , Zhou Chuanxia , Liu Xinwei 
Published: May 2023

Abstract
Generally, the independently designed charge is used in traditional ejectors, where the gunpowder is usually fixed at its end. For long-stroke ejectors, the energy from gunpowder combustion in the later period of piston movement is mostly used for structure expansion, and only a small part is converted to piston actuation. The energy for piston movement can only be improved by increasing the amount of gunpowder, which results in large instantaneous pressure in the combustion chamber, thus leading to a big impact on the system structure by the pyrotechnic products. To deal with this problem, a design method for the long-stroke ejector based on traveling charge structure is proposed. It integrates the charge structure with piston design to ensure that the energy from gunpowder combustion can fully act on the bottom of the piston during the whole combustion process, thus improving the proportion of energy from gunpowder combustion transformed to the piston’s kinetic energy and reducing the charge quantity, which will then lessen the impact of pyrotechnic products on the system structure and improve its reliability. It has been experimentally proven that when designing a long-stroke ejector, the energy utilization rate of gunpowder can be increased by about 1.5 times by adopting the traveling charge structure compared to the traditional charge structure.