bluuebunny/crossref_metadata_2025_split huggingface dataset:
A transparent photovoltaic device of NiO/CdS arrays pn junction
Authors: Fu Wendi , Pan Jiaqi , Li Chaorong 
Published: September 2021

Abstract
The transparent NiO/CdS P-N junction device composite structure was prepared by hydrothermal method and radio frequency magnetron sputtering. The results show that the NiO is orderly arranged on the CdS arrays. In addition, the photoelectric properties of the transparent NiO/CdS device grown at different hydrothermal temperatures are also different. As revealed, the device prepared at 180°Cexhibits a better photoelectric performance.
Antisolvent engineering for mixed tin-lead inorganic perovskite solar cells
Authors: Chen Hao , Zhang Ting , Li Shibin 
Published: September 2021

Abstract
Recently, inorganic perovskite has been a research hotspot due to its thermal stability and promising photovoltaic performance. Here, we demonstrate the antisolvent engineering can assist the fabrication of the mixed tin-lead inorganic perovskite films. The treated devices exhibit enhanced stability in atmosphere air. The champion perovskite solar cells (PSCs) treated with anisole exhibits a power conversion efficiency of 9.3% with an open-circuit voltage over 0.8 V.
Improved Resistive Switching of Ru: SiO2/TiO2 Based Memristive Devices
Authors: Gu P. , Nasir I. , Yang Z. Q. , Chen K. X. , Li D. Y. , Jiang X. D. , Li W. 
Published: September 2021

Abstract
In this paper, the resistive switching behaviors of Ru:SiO2/TiO2 based memristive devices have been investigated. It is found that the random and uncontrolled formation of conductive filaments in the Ru/Ru:SiO2/p++-Si devices are crucial to realize a filamentary resistive switching. It is also found that the resistive switching behavior of Ru/Ru:SiO2/p++-Si devices could be significantly improved via inserting a TiO2 interfacial layer as in the form of Ru/Ru:SiO2/TiO2/p++-Si device structure. In the modified device, strong and stable conductive filament formation could be realized when the top electrode is positively biased. In addition to nonvolatile memory applications, an analog-type switching behavior has also been realized in our newly proposed resistive switching device. The current obtained analog conductance modulation is essential for simulating synaptic functions in electronic devices for neuromorphic applications.
Preparation of strong green fluorescence carbon quantum dots for cancer cell imaging
Authors: Tao Junting , Zou Hao , Lu Xinjian , Liao Xiaokun , Pan Jiaqi , Li Chaorong , Zheng Yingying 
Published: September 2021

Abstract
Carbon quantum dots (CQDs) were prepared throught hydrothermal synthesis method. The TEM and FT-IR spectra showed the successful synthesis of CQDs and the well water solubility of CQDs. After CQDs were co-cultured with human breast cancer cells (MCF-7 cells), the cells were stained and emitted stronge green fluorescence, indicated that CQDs had a good application prospect in cancer cell imaging.
Application of New Mxene Based Materials in Electrochemical Sensors
Authors: Zhang Xiang , Gu Yu 
Published: September 2021

Abstract
In the current research on the application of new Mxene based materials in electrochemical sensors, the research on the charge storage of new Mxene based materials is not comprehensive enough. The charge storage of new Mxene based materials under different scanning rates is studied in the form of experiments. According to the needs of the experiment, experimental reagents and instruments were selected to prepare Mxene solution and new Mxene based materials. Macroporous Mxene was prepared as the electrode of EES device to store and convert energy. The enzyme was immobilized on the inner surface of Ti3C2Tx to sense biological activity. The experimental results show that the charge storage performance of the new Mxene based materials is the best when the scanning rate is 15mVs-1, which is the most suitable for electrochemical sensors.
Crystallization and phase separation of tungsten oxide-bismuth vanadate amorphous film by annealing in air
Authors: Li Chao , Song Haili , Zhang Yuanyuan , Miao Lei , Qi Ruijuan , Huang Rong , Cui Chengqiang 
Published: September 2021

Abstract
A WO3-B1VO4 amorphous film grown on the (001) yttria-stabilized zirconia (YSZ) substrate was annealed at 600 °C in air. The microstructures evolution was investigated by X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy. After annealed, the amorphous composite film crystalized into monoclinic BiVO4 and orthorhombic WO3. B1VO4 epitaxially grew on the YSZ, forming the matrix, where part of small irregular WO3 grains were embedded in. Other large-sized sub-stoichiometric WO3-6 (0<δ<3) grains with stacking faults lay on the film surface, which may contribute to the compressed strain of BiVO4 matrix vertically. Compared to the typical vertical heteroepitaxial nanocomposite of WO3-B1VO4 film grown at 600 °C by pulsed laser deposition, in the annealed composite film, the vertical lattice mismatched strain at WO3/B1VO4 interface decreased and lead to the disappearance of metastable hexagonal WO3.
Numerical investigation of flow and noise characteristics of the sea suction value
Authors: Zeng Rongtao , Sun Mingkang , Liu Jian , Bai Zongliang , Song Daoyuan , Wen Sha 
Published: September 2021

Abstract
The ship industry has been developed considerably in the engineering applications of deep-sea energy extraction, and the hydrodynamic performance and noise level of ships have become the focus of research for scholars and industries. In order to study the flow characteristics and acoustic characteristics of the sea suction valve, this paper conducts numerical simulation of the internal flow field and acoustic characteristics of the sea suction valve and the noise elimination trunk structure based on the numerical method of computational fluid dynamics. Through the study and analysis of different sea suction valve structures and different depths of noise elimination trunk on the flow characteristics and acoustic characteristics, it is helpful to provide guidance for engineering optimization design.
Study on the Dynamic Behavior and Impact of Tire Fragments on Aviation Aluminum Alloy Plates
Authors: Zhang Ke , Chen Qing , Wu Xiaoyang , Wang Peiyan , Yue Zhufeng 
Published: September 2021

Abstract
This paper presented the dynamic behavior of tire fragments and their impact on aluminum alloy plates by the methods of experiment and numerical simulation. In the experiment, the impacts of tire fragments on aluminum alloy plates under quadrilateral constraint, bilateral constraint and four-corner constraint were studied. According to the experimental results and based on Ogden model and Johnson-Cook model, a simulation calculation model for fragment impact was proposed. Analysis of plastic deformation area, failure mode, etc. verified that the proposed model could stimulate the impact of tire fragments on aluminum alloy plates. By comparing different constraint conditions, it is found that within the impact range, the plate under quadrilateral constraint can resist the strongest impact.
A Survey of Application and Development of Small Disturbance Equation Method in the Aviation Area
Authors: Shan Shuang , Chen Weiyu , Chen Zelong 
Published: September 2021

Abstract
All the small disturbance equation (SDE) methods, which are a useful technique to enhance the stability and security of the aircraft, play a significant role in the development of the aviation area. This review paper briefly introduces the development of the SDE and summarizes the two calculation methods combining with the SDE and application of the SDE method in the aviation area. The calculation methods mainly focus on the approximate factorization (AF) algorithm with the SDE and Newton-Orthomin method with the SDE. AF algorithm with the SDE is robust enough, and it can choose the calculation methods according to accuracy rather than stability that significantly saves the calculation cost. The newton-Orthomin method with the SDE can improve computing efficiency by 2.1 to 4.5 times compared with the monotone AF method. The direction of application focus on the flutter analysis, gust analysis and resizing of some component in the aircraft and the disadvantages are explored for each type. In conclusion, the combination of the SDE with the other algorithms can increase calculation efficiency, and the SDE has a wide range of applications in the aviation area. This paper can provide relevant references for the subsequent combination of the SDE and other algorithms development or practical application of SDE.
APPLICATION OF MESO-MODEL OF CONCRETE LOW-VELOCITY IMPACT IN PAVEMENT
Authors: Zhang Xiaoliang , Wang Junpei , Feng Xuekai , Ning Huijun 
Published: September 2021

Abstract
Concrete pavement is one of the typical highway structures at home and abroad. Most of the existing research on the performance of concrete pavement is based on the macroscopic angle of view. The complex meso-structure inside is ignored. Due to the incomplete research on concrete pavement structure, it is difficult to reveal the physical mechanism of concrete pavement deformation and damage. In order to understand the failure mechanism of concrete pavement more clearly, this paper started from the microscopic perspective. Firstly, based on the experimental phenomena, a multi-grade aggregate model was randomly placed in the concrete slab, and the interface between the aggregate and mortar was generated at the same time to establish a three-dimensional three-phase mesoscopic bone and the finite element calculation model of the material. Secondly, the damage effect of concrete specimens in homogeneous modeling, meso-modeling and experimental phenomena were compared to verify the accuracy of the selected concrete material parameters and the feasibility of meso-modeling method. Finally, the concrete failure form under three different aggregate contents and the influence of internal aggregate content of the concrete pavement on the mechanical properties of the concrete pavement were analyzed. The calculation results showed that compared with the macroscopic simulation, the mesoscopic model was more consistent with the experimental phenomena of the failure effect of the concrete specimens. And the numerical simulation results with the aggregate content of 46.6% were the most consistent with the experimental results. Comparing the failure modes of concrete specimens with different aggregate contents, it was found that the concrete specimens with an aggregate content of 60.6% have a lighter degree of damage. When the aggregate content was 30.6%, the impact tooth penetrated half of thickness of the concrete specimen, and the aggregate content is 60.6% of the impact teeth penetrated one third of the concrete specimen. Therefore, the higher the aggregate content is, the stronger the ability of the concrete specimens has to resist damage.
A Quasi-Static Model of Explosive Spherical Charge in Rock and Soil with Impulsive Impedance
Authors: Pengyi Li , Yunzhe Liu , Shiying Tang , Qiang Lu , Kaikai Li , Ao Li 
Published: September 2021

Abstract
The incident wave pressure acting on the wall of the spherical charge in the rock and soil is an important factor affecting the size of the explosion cavity, and the pressure of the incident wave is related to the impedance of both the explosive and the rock and soil. In this paper, based on the quasi-static model of explosive spherical charge in rock and soil, the impact impedance was introduced to calculate the size of explosion cavity in rock and soil medium. Through the field underground explosion experiment, it is found that the calculation result of the impact impedance model is 6.15% higher than the original model, and the influence rule of several geotechnical medium parameters on the cavity size was also analyzed.
Research on Aircraft Ditching State Selection Based on Floating Characteristics of Water Surface
Authors: Jiang Ting , Zuo Zi-bin , Sun Feng , Hu Qi , Luo Peng 
Published: September 2021

Abstract
When an airplane is forced to ditching on water, slight state changes, such as weight, center of gravity, initial attitude, etc., will have great influence on the ditching performance and floating ability of the airplane. In order to study the floating ability of the aircraft under the above parameters, this paper takes a fixed-wing aircraft as the basis model, and based on hydrostatics, divides the water inflow into several tiny water inflow segments. By studying the floating attitude and floating time of different aircraft states, the influence law of the center of gravity position parameters on the floating time is mastered. The research shows that the floating time and water inflow volume of the aircraft will be significantly increased when the higher center of gravity position and the non-most unfavorable longitudinal range of the center of gravity are adopted, and forced landing on water in this state can provide emergency evacuation and escape for the aircraft personnel.
Optical simulation analysis and study of UTEM electron gun
Authors: Chen He , Dong Quanlin , Wang Haiyang , Yang Ziyu 
Published: September 2021

Abstract
In this paper, the electric field intensity of the electrode structure of the thermally emitted electron gun of UTEM is simulated, and the relation between the electric field intensity distribution and the electrode plate is analyzed. Using the electronic optics software, the optical system of the electron gun is simulated, the performance parameters of the electron gun are obtained, and the advantages and disadvantages of the whole optical system are analyzed. The research results of this paper can provide a reference for the design and simulation of similar electron gun.
Numerical investigation on water-entry impact load of TMA based on CEL algorithm
Authors: Hao Dong , Yu Jing 
Published: September 2021

Abstract
This work presents comprehensive numerical research on the impact load of the trans-medium aircraft (TMA) using the coupled Eulerian-Lagrangian (CEL) method during a water-entry event. The water-entry velocity, angle, and attitude play a significant role in the impact load characteristics of the water-entry trajectory. In this paper, a numerical model of a typical TMA structure is established to study the water-entry load with the velocity 0, 2m/s, 4m/s, 6m/s, 8m/s, the angle 90°, 80°, 70°, 60°, 50°, the attitude 90°, 80°, 70°, 60°, 50°. Subsequently, the variation laws of the impact load with different water-entry velocity, angle, and attitude are analyzed. The results obtained from this investigation can supply a good reference to structural design of the TMA.
Analysis of Euler Characteristic
Authors: Liu Yilin 
Published: September 2021

Abstract
Usually, people first learn about Euler characteristic in three-dimensional space, related to the famous Euler formula. This invariant is explained in a top-down manner. In particular, there is an invariant first defined on general smooth manifold. Then, looking at different properties of this invariant leads to the discover of coincidence with Euler formula in lower dimension case. This paper extends the definition of Euler characteristic to more general geometries by glueing, and seeks for some possible applications. Result shows that Euler Charisteristic is an useful invariant that ties many subject in topology together. By studying Euler Characteristic in various cases, one may found interesting relationship between objects that are not seemingly related.
Predict the Plastic Deformation of Perforated Sheet Metals using Image-based Finite Element Modeling
Authors: Wang Lin 
Published: September 2021

Abstract
In this work, numerical prediction of the plastic deformation behaviors of perforated sheet metals, specifically AISI 1018 low carbon steel, C260 Cu-Zn brass, under uniaxial tension was carried out. An image-based mesh generation technique was applied to better represent and discretize the perforated geometry of sheet metal specimens. Digital image correlation measured displacement boundary conditions were also implemented into the finite element modeling. The predicted results of perforated sheet metal under tension as nominal stress-strain curves and localized plastic strain distribution agree well with the experimental observations. Possible error sources and uncertainty of this image-based finite element modeling were also discussed.
A comparison of the extended Kompaneets equations with the Ross-McCray equation
Authors: Miao Yuchan , Gao Haixiang , Liu Dangbo 
Published: September 2021

Abstract
The Kompaneets and the Ross-McCray equations can be used to describe the Comptonization process. However, the classical Kompaneets equation fails to describe down-Comptonization while Ross-McCray equation can be applied to describe down-Comptonization but inappropriate for a blackbody equilibrium. Fortunately, the Kompaneets equation extended by frequency and the Kompaneets equation extended by momentum can solve both problems. The different physical connotations behind the four equations bring about formal differences that allow the spectral evolution under different conditions to show different characteristics. In order to compare the differences between the four equations, the evolution of our common radiation spectra in astrophysics is numerically calculated in this paper. Besides, the differences between the four diffusion equations are discussed from their physical significance to the evolutionary phenomena. According to the results, the four equations evolve at different rates during down-Comptonization, from fast to slow in order of the Kompaneets equation extended by frequency, the Kompaneets equation extended by momentum, the classical Kompaneets equation and the Ross-McCray equation. The regression of the four equations is consistent during up-Comptonization. The Ross-McCray equation eventually converges to a different end state at near equilibrium. These results shed light on analytical development of Comptonization process.
Yield Estimation Model and Its Accuracy Analysis for Near-Surface Explosions of Soil-Rock-Mixture Site
Authors: Zhang Liangyong , Tang Shiying , Lu Qiang , Li Xin , Fang Houlin , Li Yaolong , Zhang Dezhi 
Published: September 2021

AbstractExplosion yield estimation based on seismic data (ground motion in the near field) is one common approach to estimate near-surface explosion yield. The near-surface yield estimation models of different site media are usually established through chemical explosion experiments. However, the site media of current chemical explosion experiments are mainly soil and hard rock, lacking the experiment data and yield estimation model of soil-rock-mixture site. To solve the above problem, the seismic (ground motion) data of chemical explosion experiments at different depths in soil-rock-mixture site were gathered to establish the near-surface yield estimation model for soil-rock-mixture site. Besides, analysis was made regarding yield estimation accuracy and effects of rock-soil types on accuracy. The results show that the rock-soil type has great influence on the yield estimation accuracy of near-surface explosions, and the near-surface yield estimation model of soil-rock-mixture site has high accuracy in estimating explosion yield.
Research on the optimal strategy of desert crossing game under known weather conditions
Authors: Song Xiaonan , Feng Xiaojie , Mao Yuanyuan 
Published: September 2021

Abstract
The “Crossing the Desert” mini-game needs to consider a variety of mutually restrictive factors. Players must coordinate funding and path issues to find the optimal strategy to reach the end within the specified time. Based on the study of crossing the desert when the weather conditions are known, this paper establishes a topology model, and uses priority search and game theory to solve the player’s optimal strategy for passing through the barriers. First, the entire map is digitized and represented by a general topological map; then, given the map and weather distribution, the highest profit of each path is calculated. Specific calculation details require further analysis to arrive at a more practical and efficient route planning plan. The model proposed in this paper only provides a more effective solution for this problem from the perspective of mathematical modeling.
A note on vanishment of Fourier coefficients
Authors: Mo Junyi 
Published: September 2021

Abstract
A Fourier series is one of the methods to represent a function as a summation of orthogonal functions. In this paper, we give a detailed proof of a property regarding the behavior of a function at its continuity points. Finally, we show that an integrable function vanishes at its continuity points if all of its Fourier coefficients vanish.
Numerical study on subsonic-supersonic Laval nozzle
Authors: Ji Xingyue , Zhi Junshen , Pan Hongyu 
Published: September 2021

Abstract
Because subsonic-supersonic Laval nozzles are widely used in many fields, the flow characteristics of the subsonic-supersonic Laval nozzle are studied by numerical simulation. First, the MacCormack scheme is used to discrete the non-conservation and conservation forms of the governing equations of the flow in the subsonic-supersonic Laval nozzle. The flow states inside the nozzle in both formats are then compared. The results show that the numerical results of the two schemes converge well. The variation of the fluid velocity and outlet pressure is more pronounced in the non-conservative form. For the conservation form, the error of the mass flow rates at different positions is constant and acceptable, which is about 1%. For the non-conservation form, the error at different locations within the nozzle is different, reaching a minimum error at the throat. In addition, studies on grid length have demonstrated that the finer the grid, the more accurate and stable the results Moreover, for the subsonic, supersonic isentropic flow in the quasi-one-dimensional nozzle, the Mach number and velocity become larger along with the nozzle. In contrast, other variables such as pressure and temperature become smaller. There is a subsonic region in front of the throat and a supersonic region behind the throat. The Mach number of the nozzle exit can be very high. Finally, the study reveals the internal flow state of the subsonic, supersonic nozzle, which can provide theoretical reference for the application of the nozzle.
Dynamic Characteristics Analysis and Chaotic Synchronization of Fractional Order Financial Dynamic System
Authors: Liu Xiaoshan , Dong Jun , Han Liang , Ma Hu 
Published: September 2021

Abstract
The equations of time-delay fractional order financial dynamic system are studied. Fractional calculus, as the expansion of the corresponding integer parts, has more complex definition and update laws. It is found that modeling by fractional-order differential equation in some nature phenomenon and engineering field can be consistent with essentiality of the phenomenon and matters, such as in mathematical modeling of viscoelastic materials, electromagnetic wave and other fields. Moreover, there exist more complex dynamical behaviors in fractional-order dynamical system than in integral-order one, and it has more preferable history memory ability. Therefore, it is of theoretical value and practical significance researching the fractional-order nonlinear dynamical systems on the base of the researches on the traditional integral-order nonlinear dynamical system.