bluuebunny/crossref_metadata_2025_split huggingface dataset:
A high-efficient photo-thermoelectric coupling generator of cuprous iodide
Authors: Cao Chongyang , Chen Shuai , Liang Jiawen , Li Tingting , Yan Zhanlin , Zhang Bing , Chen Naichao 
Published: November 2022

Thermoelectric (TE) energy converters have attracted great interest due to their maintenance-free, long-life, and high-reliability properties. However, improving the output power of TE devices remains a huge challenge. In this work, a high-efficient photo-TE coupling generator based on cuprous iodide (CuI) film is proposed to increase the output power of TE devices. Here, CuI film was prepared by the successive ionic layer adsorption and reaction method. The influence of the photovoltaic (PV) effect on the TE output voltage of CuI film was investigated by an analysis of the experimental results. The results showed that the output voltage of the photo-TE coupling generator had a maximum increment of 83.47% at 343 K compared to the sum of TE and PV voltages. The increase in the output voltage was mainly because of the PV effect rather than the TE effect, while the photo-generated electrons also induce a considerable change in the TE figure of merit. Hence, the strategy proposed in this work might be a potential approach to further improve the output performance of other TE materials.
The short-range order in liquid water and amorphous ice
Authors: Ellert Neta , Yahel Eyal , Makov Guy 
Published: November 2022

The short-range order in water and ice was determined from experimentally measured partial radial distribution functions by applying the Quasi Crystalline Model (QCM). Partial radial distribution functions were analyzed for water at several pressures and temperatures, crystalline ice, and for the three known phases of amorphous ice: Low-Density Amorphous (LDA), High-Density Amorphous (HDA), and Very-High-Density Amorphous (VHDA). It was found that at low temperatures and pressures, the short-range order of water is similar to that of the hexagonal ice (Ih) structure. At higher pressures and low temperatures, the short-range order of water becomes similar to that of tetragonal ice III structures with a c/a ratio of 0.8. At higher temperatures of 573 K, the short-range order obtained was similar to that of rhombohedral ice II (α = 113°). As for the amorphous ices, we conclude from the QCM analysis that these three forms are structurally distinct with short-range orders corresponding to ice Ih, ice III, and ice II for LDA, HDA, and VHDA ices, respectively.
220 nm deep-UV coherent source based on fifth-harmonic generation in ADP and DKDP crystals
Authors: Cui Zijian , Sun Mingying , Wang Chao , Shen Bin , Zhang Xu , Liu De’an , Zhu Jianqiang 
Published: November 2022

Based on the 1.1 μm laser radiation obtained by parametrically amplifying Yb:YAG laser using frequency doubling of Nd:YAG laser, a 220 nm deep-UV coherent source was systematically presented via the efficient fifth-harmonic generation (FiHG) in NH4H2PO4 (ADP) and KD2PO4 (DKDP) crystals. In ADP crystals, noncritical phase-matching (NCPM) fourth-harmonic generation (FHG) and FiHG were realized at 109.4 and 31.6 °C, respectively. For DKDP crystals, we demonstrated the critical phase-matching FHG at 57.5 °C and verified that NCPM FiHG can be achieved at 38.7 °C, which was the first demonstration of the FiHG using the DKDP crystal to our knowledge. The energy-dependent conversion efficiencies, angular acceptances, and temperature acceptances of these nonlinear processes were systematically measured. The highest total conversion efficiencies from 1.1 μm to the fifth harmonic in ADP and DKDP crystals were 17.5% and 23.6%, respectively. Owing to the large-aperture availability of KDP-family crystals, this work paves the way for the generation and application of high-energy and high-peak-power deep-UV laser radiation.
Study of a low-frequency wireless charging system crossing the metal Dewar wall of a high-temperature superconducting magnet
Authors: Liu Guanjie , Gao Runqian , Tian Chenyu , Wang Danyang , Wu Yilong , Wang Yufei , Zhang Guomin 
Published: November 2022

Abstract
Using a wireless charging method to charge high-temperature superconducting (HTS) magnets is a way to solve the existing problem of high leakage heat introduced by charging through current leads. However, the available studies on charging HTS magnets using wireless charging methods rarely involve the role of a Dewar in the charging process. Nowadays, most HTS magnets use a metal Dewar because of the high requirements of the Dewar for gas tightness and mechanical strength. How to charge the HTS magnets wirelessly through the metal walls of the Dewar is an issue that needs to be addressed. In response to the above concerns, taking into account the role of the metal Dewar, a low-frequency wireless charging system with an isolation transformer as the core is proposed in this paper, where the primary coil of the transformer is a copper coil, installed on the outside of the Dewar. The secondary coil is a superconducting coil, installed on the inside of the Dewar. A theoretical model of the proposed wireless charging system is developed, and the prototype is fabricated based on the theoretical model. Both numerical and experimental methods were used to study the operational characteristics of the prototype, and the experimental results proved the validity of the theoretical model and the numerical model in this paper. Experimental results show that the proposed wireless charging system can charge an 8.5 mH HTS magnet with a current of 48.58 A over a 6 cm transmission distance, where the 6 cm gap includes a 1.6 mm thick metal wall. The results in this paper can provide new ideas for research work on charging HTS magnets wirelessly through a metal Dewar.
CosmicNet II: emulating extended cosmologies with efficient and accurate neural networks
Authors: Günther Sven , Lesgourgues Julien , Samaras Georgios , Schöneberg Nils , Stadtmann Florian , Fidler Christian , Torrado Jesús 
Published: November 2022

AbstractIn modern analysis pipelines, Einstein-Boltzmann Solvers (EBSs) are an invaluable tool for obtaining CMB and matter power spectra. To significantly accelerate the computation of these observables, the CosmicNet strategy is to replace the usual bottleneck of an EBS, which is the integration of a system of differential equations for linear cosmological perturbations, by trained neural networks. This strategy offers several advantages compared to the direct emulation of the final observables, including very small networks that are easy to train in high-dimensional parameter spaces, and which do not depend by construction on primordial spectrum parameters nor observation-related quantities such as selection functions. In this second CosmicNet paper, we present a more efficient set of networks that are already trained for extended cosmologies beyond ΛCDM, with massive neutrinos, extra relativistic degrees of freedom, spatial curvature, and dynamical dark energy. We publicly release a new branch of theclasscode, calledclassnet, which automatically uses networks within a region of trusted accuracy. We demonstrate the accuracy and performance ofclassnetby presenting several parameter inference runs from Planck, BAO and supernovae data, performed withclassnetand thecobayainference package. We have eliminated the perturbation module as a bottleneck of the EBS, with a speedup that is even more remarkable in extended cosmologies, where the usual approach would have been more expensive while the network's performance remains the same. We obtain a speedup factor of order 150 for the emulated perturbation module ofclass. For the whole code, this translates into an overall speedup factor of order 3 when computing CMB harmonic spectra (now dominated by the highly parallelizable and further optimizable line-of-sight integration), and of order 50 when computing matter power spectra (less than 0.1 seconds even in extended cosmologies).
Hybrid C8-BTBT/InGaAs nanowire heterojunction for artificial photosynaptic transistors
Authors: Nie Yiling , Xie Pengshan , Chen Xu , Jin Chenxing , Liu Wanrong , Shi Xiaofang , Xu Yunchao , Peng Yongyi , Ho Johnny C. , Sun Jia , Yang Junliang 
Published: November 2022

Abstract
The emergence of light-tunable synaptic transistors provides opportunities to break through the von Neumann bottleneck and enable neuromorphic computing. Herein, a multifunctional synaptic transistor is constructed by using 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) and indium gallium arsenide (InGaAs) nanowires (NWs) hybrid heterojunction thin film as the active layer. Under illumination, the Type-I C8-BTBT/InGaAs NWs heterojunction would make the dissociated photogenerated excitons more difficult to recombine. The persistent photoconductivity caused by charge trapping can then be used to mimic photosynaptic behaviors, including excitatory postsynaptic current, long/short-term memory and Pavlovian learning. Furthermore, a high classification accuracy of 89.72% can be achieved through the single-layer-perceptron hardware-based neural network built from C8-BTBT/InGaAs NWs synaptic transistors. Thus, this work could provide new insights into the fabrication of high-performance optoelectronic synaptic devices.
Four-channel CWDM transmitter chip based on thin-film lithium niobate platform
Authors: Chen Kaixuan , Chen Gengxin , Ruan Ziliang , Fan Xuancong , Zhang Junwei , Gan Ranfeng , Liu Jie , Dai Daoxin , Guo Changjian , Liu Liu 
Published: November 2022

Abstract
Multi-lane integrated transmitter chips are key components in future compact optical modules to realize high-speed optical interconnects. Thin-film lithium niobate (TFLN) photonics have emerged as a promising platform for achieving high-performance chip-scale optical systems. Combining a coarse wavelength-division multiplexing (CWDM) devices using fabrication-tolerant angled multimode interferometer structure and high-performance electro-optical modulators, we demonstrate monolithic on-chip four-channel CWDM transmitter on the TFLN platform for the first time. The four-channel CWDM transmitter enables high-speed transmissions of 100 Gb/s data rate per wavelength channel (i.e., an aggregated date rate of 400 Gb/s).
UME Kibble balance operating in air
Authors: Ahmedov Hacı , Orhan Recep , Korutlu Beste 
Published: November 2022

Abstract
The UME KB-3 operating since 2020 allows the realization of kilogram under ambient air conditions owing to its distinguishing design and operation protocol. This is possible only because the coil pair is stationary but the surrounding magnet assembly is moving. The mechanically decoupled nature of the magnet assembly allows the implementation of a local vacuum for displacement measurements rather than a vacuum covering the entire apparatus. The balance operates in single mode with simultaneous operation of weighing and moving phases instead of successive phases. A novel dynamical measurement procedure is developed in order to conform with the single phase measurements. The paper describes the apparatus and presents the measurement results for stainless steel mass artefact with a nominal value of 1 kg. The mass of the artefact is measured with a total relative uncertainty of 54 ppb.
Network meta-analysis: a statistical physics perspective
Authors: Davies Annabel L , Galla Tobias 
Published: November 2022

Abstract
Network meta-analysis (NMA) is a technique used in medical statistics to combine evidence from multiple medical trials. NMA defines an inference and information processing problem on a network of treatment options and trials connecting the treatments. We believe that statistical physics can offer useful ideas and tools for this area, including from the theory of complex networks, stochastic modelling and simulation techniques. The lack of a unique source that would allow physicists to learn about NMA effectively is a barrier to this. In this article we aim to present the ‘NMA problem’ and existing approaches to it coherently and in a language accessible to statistical physicists. We also summarise existing points of contact between statistical physics and NMA, and describe our ideas of how physics might make a difference for NMA in the future. The overall goal of the article is to attract physicists to this interesting, timely and worthwhile field of research.
Research on space construction and selection method of space-based information support equipment
Authors: Chang Qing , Liu Desheng , Yang Yang 
Published: November 2022

Abstract
With the rapid development of information technology and space technology, the important position of space-based information support equipment is increasingly prominent. However, the increasing types and quantities of space-based information support equipment also put forward higher requirements for the formulation of combat plans, decision-making and deployment of combat equipment. In this paper, based on the seven-step method, an ontology construction method suitable for space-based information support equipment is proposed, and the ontology construction tool Protégé is used to realize the ontology modeling of space-based information support equipment. By acquiring open source satellite data, the knowledge map construction tool Neo4j is used to construct the knowledge map of space-based information support equipment. Finally, the space-based information support equipment conforming to the combat mission can be obtained to provide assistance for the formulation of the combat plan and the decision of equipment utilization.
Study on the relationship between the length of mixing layer and the characteristic scale of mixing layer in multi-strut ejector
Authors: Zhou Letian , Xu Wanwu , Ye Wei 
Published: November 2022

Abstract
The flow structure of the multi-strut ejector based on jet segmentation has an obvious relationship with the transverse characteristic scale of the jet. Therefore, this paper studies the relationship between jet transverse characteristic size and mixing layer. Through the simulation of multi-strut ejectors with different number of struts, the development of mixing layer in the mixing process of jets with different transverse characteristic sizes is compared under the same boundary conditions. It is concluded that when there is no obvious coupling effect between the mixing layer and the shock & expansion wave, there is a linear relationship between the transverse characteristic scale of the jet and the mixing length of the flow direction, and the jet mixing with different transverse characteristic scales is consistent. When the shockwaves and expansion waves are strongly coupled with the mixing layer, the linear relationship between the jet transverse characteristic scale and the mixing layer length is not strong.
Noise simulation of wake field of solid rocket motor
Authors: Gao Yuhang , Zheng Jian 
Published: November 2022

Abstract
When the rocket engine works, it will produce high-temperature and high-speed gas, which will be rapidly mixed with the surrounding medium, and will produce huge jet noise. This paper studies jet flow field and sound field of rocket engine using Fluent. The broadband noise simulation shows that the noise distribution is related to the nozzle jet. The sound pressure data of transient FW-H observation points show that the noise frequency distribution is wide. At the same time, the size of the noise will increase with the increase of the inlet pressure, and the influence range will become larger with the increase of area expansion ratio.
Research on construction method of modular missile family general components based on self-organizing mapping
Authors: Guo Feiran , Yu Jianqiao 
Published: November 2022

Abstract
-As far as the missile family is concerned, the general components are an important part of the missile types in the missile family. At the same time, they are also a major advantage and feature of collaborative design of multiple missile types to form the missile family. In view of the poor universality of modules in traditional missile design, this paper proposes a general components construction method based on self-organizing mapping, which aggregates the components with similar structure and little difference in performance parameters as general components, so as to maximize the proportion of general components in the component library under the condition of meeting the performance index, and then improve the efficiency of missile equipment system while reducing the design cost.
Analysis of the influence of wave parameters on helicopter floating characteristics
Authors: Jiang Ting , Shi Sheng-zhe , Zheng Xiao-long 
Published: November 2022

Abstract
Foreign countries have accumulated rich experience in the research of helicopter floating characteristics. From the model test in the 1950s to the current numerical simulation and extrapolation evaluation, its technical maturity is significantly higher than that in domestic related fields. In order to fully study the influence of wave parameters on helicopter floating characteristics, sort out and refine the model test methods suitable for the study of helicopter floating characteristics, this paper takes a helicopter model as the research object, and carries out the research on the helicopter model test technology with emergency buoys, focusing on the influence range of wave parameters and wave direction on helicopter test results. The results show that the motion response of the helicopter under regular wave conditions presents typical periodic changes. When the helicopter encounters the influence of transverse wave, the rolling amplitude decreases with the increase of wavelength, and the acceleration amplitude of the nose and in the aircraft first increases and then decreases with the increase of wavelength; Under other wave direction conditions, the rolling angle, the acceleration amplitude of the nose and in the machine first increase and then decrease with the increase of the wavelength.
The Satellite Coverage Analysis is Based on a Combination of STK and MATLAB
Authors: Zhang Cheng , Wang Xuegang , Liu Yunzheng 
Published: November 2022

Abstract
In maritime military operations, reconnaissance satellites can provide all-around and efficient reconnaissance and surveillance of target areas in established orbits, regardless of territorial, airspace, and territorial sea restrictions, and are a beneficial means of leadership in today's military. STK can construct satellite motion models, and MATLAB can invoke the STK function module to achieve complex scene generation. The two are combined, respectively, with Walk Constellation grouping and single-satellite simulation of specific target areas at sea, resulting in coverage analysis reports with good results.
Mars Ascent Trajectory Optimization Based on Convex Optimization
Authors: Lan Yu , Li Ji 
Published: November 2022

Abstract
In this paper, a Mars ascent trajectory optimization algorithm based on convex optimization is designed for the Mars ascent trajectory optimization problem. The main accomplishment of this paper is the trajectory optimization of the second-stage ignition based on the convex optimization. For the first-stage ignition, open-loop guidance is used. In this stage, the ascender flies using the maximum thrust to track the attitude profile, thus completing the ascent flight control. In the presence of errors in the first-stage ignition, the experiment generates multiple sets of first-stage shutdown point data and completes simulation verification experiments based on them. The simulation verifies that the second-stage ignition trajectory optimization based on convex optimization algorithm can achieve high accuracy into orbit despite the large starting point deviation.
The dynamic model of the high-thrust orbital maneuvering engine with storable propellant
Authors: Su Qingdong , Wang Jinjin , Yan Mingxia , Sun Zhensheng , Zha Bailin , Huang Weifeng 
Published: November 2022

Abstract
The storable propellant rocket engine has the advantages of long-term storage and rapid use. A new design of a large-thrust orbital maneuvering engine is proposed for the first time and the dynamic model for working process is established by the multi-disciplinary dynamics simulation software AMEsim. The accurate model parameters of hydraulic and combustion components are obtained through actual unit tests. The dynamic characteristics of the engine are calculated and evaluated in detail, and the results show that the system has good robustness to disturbance parameters. The fluctuation of the propellant tank pressure has little influence on operating parameters. The peak pressure of the water hammer, especially at the tank outlet pipe, is about 17 times higher than the stable state. The starting sequence influences working conditions of the mixing ratio regulator and the thrust chamber for less than 0.1s, and has no influence on the stable working state of the engine. The research provides an effective method for designing a high-thrust orbital maneuvering engine system, which has broad prospects in low-Earth orbit transportation and military missions.
Structural Optimization of Single Crystal Turbine Blade Based on Recrystallization Critical Stress
Authors: Li Shifeng , Chen Suling , Ren Siyuan 
Published: November 2022

Abstract
In view of the problem that the surface structural recrystallization (SRR) is very easy to occur in the splitting gap area of the single crystal blade. A method to control the residual stress is proposed that based on the critical stress of single crystal recrystallization, and the structural details are optimized by combined with the numerical calculation and experimental verification. To reduce the residual stress level and change the residual stress distribution in the single crystal blade splitting gap. So as to control the level of residual stress, which is no more than the recrystallization critical stress. Finally, the experimental verification is completed by the optimized blade. The verification results show that the maximum residual stress is reduced by about 10% in the tail splitting region, and the recrystallization structure is completely eliminated in the original structure. It is proved that this method is a great effectiveness to control the structural integrity and surface structure connectivity of the single crystal blade.
Influence of brake-disc friction characteristics on anti-skid braking control system of aircraft
Authors: Du Xiaoqiong , Li Bin , Luo Linyin 
Published: November 2022

Abstract
The low-frequency landing gear walk of aircraft during braking processis studied. Firstly, by virtual of LMS Virtual.Lab motion software, the multi-body dynamic model of the landing gear is established, the motion pair and internal and external loads are applied, and the torsion spring is set at the connection between the landing gear and the fuselage to simulate the flexibility of the landing gear. Then, the variation of friction coefficient of brake discis considered in the model of braking pressure and torque. When the braking control system works, if the braking pressure is less than the limit value, the gear walk is less affected by the friction characteristics of the brake disc. If the braking pressure reaches the limit value, the law of gear walk is the same as that of the pilot's manual control of the braking pressure. At this time, the gear walk is only affected by the positive and negative slope of the friction coefficient of the brake disc. If the friction coefficient curve of the brake disc presents a negative slope, it may cause gear walk, and the greater the absolute value of the slope, the more obvious the gear walk is. Improving the friction characteristics of brake discs can provide a new strategy forgear walk control.