bluuebunny/crossref_metadata_2025_split huggingface dataset:
AI Model to Generate SQL Queries from Natural Language Instructions through Voice
Authors: Sawant Aditya , Raina Rohit , Patil Anuja , Pardeshi Anand 
Published: June 2022

Abstract
Data plays the most important role in the development of industries, small businesses. Even world leaders need the data to make analyses and make better policies for people. In almost every field where the work process is digitized need to store data and then retrieve it. According to statistics most of the data is stored in the relational database and for manipulations of the data, Structured Query Language(SQL) is commonly used. So for handling databases a person need to have specialized knowledge regarding the queries and had to remember the syntax of many complex queries. So to enhance data manipulation using SQL and to efficiently get the required query, the paper proposes a method for the generation of SQL query from natural language input, spoken(audio input) by the user. The model is constructed on NLP (Natural Language Processing) and Neural Networks (Deep Learning) technologies. Long Short Term Memory(LSTM) Model is used for predicting queries and is trained on the dataset with natural language as input and returns outline skeletal structure of the query as output. Then the output will be processed and the final query will be displayed to the user. The project also aims to benefit the people who are suffering from Repetitive Stress Injury (RSI), causing pain in the finger joints, which has been attributed to work requiring a long period of typing and also to those who are not familiar with SQL queries. As this system will readily provide the required query.
Delineation of groundwater potential zones in Safei watershed, Sundargarh, Odisha, using Remote Sensing and GIS techniques
Authors: Mohanty Swapnajit , Diwan P , Vishwakarma N. , Jhariya D C 
Published: June 2022

Abstract
Versatile use of groundwater made it more demanding and priceless. Rising inhabitants getting more dependent on groundwater and exploiting it rapidly. So we need to explore more groundwater potential zones for development and growth. This study done by unification of data files and maps such as satellite imagery, drainage, groundwater level, rainfall, land use land cover, slope, and existing maps of geology, in order to highlight groundwater prospect areas. Using overlay analysis tool safei watershed has been assigned weightage for the influencing factors. This study shows best suitable result for the groundwater prospecting. Today’s groundwater screenplay of town and commercial area of Safei watershed is considered as comestible for drinking purposes, handling. Additionally it is be in need of zones where groundwater found in excessive quantity for multifaceted application of human welfare.
Fabrication of UV-VIS photodetector based on the ZnO/MoS2 and ZnO/WS2 heterostructures
Authors: Winata Suci Mufidah , Fauzia Vivi 
Published: June 2022

Abstract
Two-dimensional layers of the transition metal dichalcogenides (2D TMDs) such as molybdenum disulfide (MoS2) and tungsten disulfide (WS2) attract much attention due to their potential applications in optoelectronic devices. MoS2 and WS2 with tunable bandgap are promising materials to enhance the light absorption range on ZnO-based photodetector. In this work, we report that the exfoliated MoS2 and WS2 were deposited on the surface ZnO nanorods for UV-vis photodetector application. The photoelectrical response of photodetector was observed using electrometer under 325, 505, and 625 nm laser diodes as UV and visible light sources. This study shows that the addition of MoS2 and WS2 could improve the performance of the ZnO photodetector due to higher photocurrent. The increase in both dark current and photocurrent is not yet clearly understood, but it may be that the edge sites of MoS2 and WS2 play a vital role to reduce the natural defects of ZnO; hence the mobility of charge carriers was improved.
Spectral characteristic of symmetric double tapered plastic optical fibers
Authors: Marinah M. , Puspita I. , Banurea D.P.M. , Zyrlirosa  , Hatta A.M. , Koentjoro Sekartedjo 
Published: June 2022

AbstractPlastic optical fiber (POF) sensor has been immensely developed for many sensing applications including physical and chemical/bio sensor. Since it offers the advantages of non-destructive, easy fabrication and installation, immunity to electromagnetic interference, compact, low fabrication costs and higher durability compare to silica fiber sensor. Tapered POF is one of the modified structures on POF by reducing its diameter and induces guided modes in the core to be evanescent modes. As a sensor, the tapered structure on POF increase the sensitivity of non-tapered POF. The number of tapers on optical fiber affect its characteristics as well. Hence, it is important to investigate the characteristic of tapered POF with the variation on number of tapers. In this paper, the spectral characteristic of symmetric double tapered POF (DT POF) was investigated. The fabrication of symmetric DT POF was conducted by reducing the core diameter using chemical process as described in. The core diameter and the length of the tapered were fixed at 0.45 mm and 1 cm, respectively. The distance between two tapers was varied from 1-3 cm. Transmission spectrum characterization of symmetric DT POF was measured at near infrared wavelength range (900-1600 nm) using a spectrometer by OTO-Photonics.
Analysis of Aerodynamic Characteristics of High-speed Train with Asymmetric Heads
Authors: Li Weibin , Wang Yuejun , Hao Yunquan , Zhao Wei , Zhang Yanlin 
Published: June 2022

Abstract
High-speed transportation is closely related to people’s livelihood and national economy, so it becomes an important development aspect to the whole country. The safety, comfort and economy of high-speed train are the key consideration during its design process. In the future, new trains and old ones will be used for a long time, and the performance of new trains which run on the old lines may be limited. These situations make the research of high-speed train with asymmetric heads much necessary. Aiming at the feasibility of the train with asymmetric heads, the heads of train CRH3 and another typical train with a similar speed are selected. Based on the two heads, the digital models of the traditional trains with symmetric heads and the new trains with asymmetric heads are built firstly. And then their aerodynamic characteristics are computed by the SIMPLE method. In the numerical part, the performances of the trains are compared on the condition without crosswind, which shows that one of the new trains with asymmetric heads is the best among them. Moreover, the aerodynamic characteristics of this new model under crosswind is analyzed, which demonstrates that the train with asymmetric heads is feasible. The research shows that the train with asymmetric heads can achieve better results through the proper aerodynamic shape optimization design, which presents an idea for the future high-speed train design.
Numerical simulation on static aerodynamic characteristics of supersonic cavities
Authors: Luo Lei , Chen Hongyang , Zhang Jie , Jia Hongyin , Zhang Peihong 
Published: June 2022

Abstract
A numerical study on supersonic cavity flow is carried out, where the influence law of the freestream parameters and configuration factors on static aerodynamic characteristics is investigated, focusing on the change of pressure distribution on the cavity walls at high and low Mach numbers. It is found that with the Mach number increment at high speeds (M>2), the pressure peak on the rear side of the cavity bottom floor rises, and the change in pressure distribution on the cavity walls shows a variating trend in flow type from a closed-cavity flow to an open-cavity flow, which is consistent with the law at low speeds (M≤2). At high speeds, the change in Reynolds number has a certain impact on the pressure distribution in the cavity, which is inconsistent with the law at low speeds. The increase of Reynolds number will increase the pressure on the rear side of the cavity bottom floor and on the rear wall, and the greater the Mach number, the greater the difference caused by Reynolds number variation. When the length-to-depth ratio increases at high speeds, the pressure peak on the rear side of the cavity bottom floor decreases, and the flow type is changing from an open-cavity flow to a transitional-cavity flow, which is consistent with the law at low Mach numbers, while the pressure variation is greater at high speeds. The influence of the length-to-width ratio on the pressure distribution is relatively small, and the increase of length-to-width ratio increases the pressure peak on the rear side of the cavity bottom floor slightly. Spanwise bending has a certain impact on the pressure distribution. The pressure peak on rear side of the bottom floor increases when the cavity is bending, which is consistent with the influence caused by length-to-width ratio increment.
Simulation Research on the Effect of Reynolds Number on the Aerodynamic Characteristics of High Lift Device
Authors: Zhao Hui , Yang Yueyue , Zhang Yaobing , Li Weibin 
Published: June 2022

Abstract
Based on the consideration of grid factors and turbulence model factors, the confluence boundary layer and aerodynamic characteristics of the NHLP-2D airfoil are studied. Compared with the experimental results, the grid distribution near the confluence boundary layer is important for calculating the width of the wake area. The calculation results of the structured and unstructured grids are basically the same when the surface grid distribution is the same. On the basis of the mesh refinement in the wake area, the aerodynamic characteristics calculated by the SA turbulence model and the distribution of the total pressure coefficient in the confluence boundary layer are in good agreement with the experimental results. The width of the confluence boundary layer and the wake strength decrease with the increase of Reynolds number, the lift coefficient increases with the increase of Reynolds number, but the drag and pitching moment have opposite pattern. The maximum lift of the airfoil increases as the Reynolds number increases. As the Reynolds number increases, the stall angle of attack of the airfoil gradually increases and then remains stable with the increase of the Reynolds number.
Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines
Authors: Wu Zhaoqi , Zhang Xingcheng , Song Qiming , Liu Wei , Chen Zhibing 
Published: June 2022

Abstract
There is no standard for rock-socketed pile foundation of offshore wind farm at China and abroad. According to the practical geological and environmental conditions of offshore wind power plant, response of rock-socketed pile under horizontal load was analyzed by using a finite element software, ABAQUS. Then, the parameters of rock-socketed pile, i.e. depth, pile diameter, ratio of pile diameter to thickness, and grouting thickness were investigated by orthogonal analysis and parametric analysis. It is found that the thickness of grouting has little influence on the displacement of pile head. The diameter and the ration of diameter to thickness of pile, rock-socketed depth have significant influence. The displacement of pile tip tends to stable and the bending moment at bottom of pile become zero when the rock-socketed depth reaches 3dp. The maximum Tresca stress of grouting body and 1st principal stress of rock mass decrease with an increase of rock-socketed depth.
Numerical Simulation of Orbit Controlled Hot-gas Lateral Jet of the triangular plate with rudder
Authors: Wan Zhao , Fu Yangaoxiao , Wang Xinguang , Chen Qi 
Published: June 2022

Abstract
Hypersonic interception weapons have high requirements for the efficiency and accuracy of the control system. As an effective control approach, the thermochemical non-equilibrium effect of jet flow must be considered in order to accurately predict the aerodynamic characteristic. At present, relevant researches are mostly focused on the low-flow rate hot jet, while numerical simulation and wind tunnel test studies on high-flow rate hot jet are rare. In this paper, the interaction flow field of the rail-controlled jet at the altitude of 60Km and 70Km has been simulated by solving the three-dimensional viscous fluid governing equations. The influence of the thermalchemical non-equilibrium effect of the jet interaction on the flow field characteristics and aerodynamic characteristics of the aircraft was analyzed. The primary results show that: (1) The flow fields of the cold-gas jet, frozen-gas jet and hot-gas jet have significant differences under the high-flow rate jet condition, which is mainly reflected the size and the pressure value of the separation region before the nozzle. The separation region length of the cold-gas jet is approximately twice that of the hot-gas jet and the length of the frozen-gas jet is between them; (2)Jet interaction will increase the surface pressure of the aircraft and reduce the skin-friction. When Ma=25, the aerodynamic interaction of hot jet is only about 30% of that of cold jet; (3) Jet interaction on aerodynamic characteristics increases with altitudes. With the increase of Mach number, the difference between the predicted results of hot jet and cold jet is enlarged because of the enhancement of the thermochemical non-equilibrium effect.
Experimental study of small-scale thin-layer boilover suppression using salt additive
Authors: Chen Miao , Wang Xuehui , Chen Qinpei , Wang Jian 
Published: June 2022

Abstract
The boilover is a well-known disaster for tank fires. Previous study has shown that changing the boiling point of sub-layer can suppress the small-scale thin-layer boilover, but the detail of suppression mechanism is not claimed. Thus, this study conducted experiments using salt additive with various initial fuel thickness (10mm, 15mm, 20mm). The boilover process and temperature characteristics in liquid pool is discussed. The thermal structure within the liquid pool is figure out in this paper, and the temperature evolution in burning process is analyzed. The results show that the salt additive can change the boiling point of sub-layer and the thermal structure within the liquid pool, which is the main mechanism to suppress the boilover.
Numerical Simulation of Robustness to Large Displacement of Optical Flow Based on Deep Learning
Authors: Wang Chao , Dong Xiucheng , Gu Shifu , Zhang Zhengyu 
Published: June 2022

Abstract
Traditional optical flow algorithm based on prior is sensitive to large displacement, in order to solve the problems, one optical flow algorithm based on deep learning is introduced to measure the global velocity of fluorescent oil film. The test results of numerical simulation show that the Average Endpoint Error (AEE) of HS, LK and Flownet2 are 2.4604 pixels, 2.3898 pixels and 0.9916 pixels in terms of warping 0.1s respectively, and the error of FlowNet2 is always the lowest under the conditions of large displacement. Therefore, the algorithm is more robust to large displacement than the others that is currently being used, which has certain exploration significance and engineering reference value.
Development and application of drilling and expanding integrated bit based on high pressure water jet coal breaking mechanism
Authors: Wang Fan 
Published: June 2022

Abstract
Outburst coal seam and high gas coal seam and using borehole to extract coal seam gas are the main measures to prevent coal and gas outburst, reduce gas emission and reduce air flow gas overrun in working face. Increasing borehole diameter and improving coal seam permeability are one of the common methods to improve the effect of this measure. In this paper, the drilling and expanding integrated bit is developed and designed to improve the construction efficiency. Firstly, the mechanical analysis of high-pressure water jet combined with coal breaking of drilling teeth is carried out to provide the basis for the optimization of drilling and expanding integrated bit. The optimization principles of bit and nozzle are put forward respectively. The bit material is optimized. The hardness is increased by 20 ~ 40 times by using diamond composite chip (PDC) bit. Through numerical simulation analysis, it is determined that when the nozzle l/d value is 2, the jet development can maintain good stability. The nozzle is arranged with 2 ~ 3 nozzles in radial direction and 1 ~ 2 nozzles in axial direction, and the best contraction angle is 13 ° ~ 15 °. The field test shows that the average equivalent diameter of coal 6 after reaming is 720mm, which is 9.6 times that before reaming, and the effect of reaming and pressure relief is remarkable.
Experimental Study on Fluid Elastic Instability of Concentric Circular Arrangement Heat Exchanger Tubes
Authors: Liu Mengmeng , Zhang Donghui , Song Guangdong 
Published: June 2022

Abstract
In the industrial production, there exists the phenomenon of structure vibration caused by flow, which will cause the deformation and failure of the structure and lead to the economic loss, and even cause the industrial accident and great danger. In this paper, the one mechanism of fluid-induced vibration, namely fluid elastic instability, of the concentric circle arrangement tube bundles in the sodium-sodium heat exchanger is studied experimentally. According to different central angle positions, three kinds of tubular plates are designed, which are approximately triangle arrangement, approximately square arrangement and transitional arrangement respectively. In the small-size water tunnel non-contact graphic measurement is adopted to obtain the critical flow rate Ucr when the tube bundle is unstable. The experimental results show that the flow induced vibration resistance of the transitional arrangement is better, and the critical flow velocity is about 3.78.
Structural reliability design of liquid oxygen supply pipeline based on fluid-solid-thermal coupling
Authors: Zhou Jingying , Ding Jiawei 
Published: June 2022

Abstract
Liquid oxygen supply pipeline is a key part of liquid oxygen kerosene engine test system. If leakage occurs, it will cause flow measurement error and affect the accuracy of test data. Therefore, in the design of liquid oxygen supply pipeline, the fluid solid thermal coupling simulation analysis method is used to analyze the stress of “Z” bend, vessel bottom elbow and balance device elbow pipeline of the supply pipeline in the process of ultra-low temperature fluid flow, the optimal laying scheme of the “Z” bend route is obtained, and it is verified that the added elbow pipeline fixing support structure can effectively resist the blind plate force and improve the pipeline reliability, which provides an important reference for the structural design of liquid oxygen supply pipeline.
Models and Programs of the Gain and Noise Figure of the Nd-doped Fiber Amplifier in 1.7-1.8μm Band
Authors: Wang Youfei 
Published: June 2022

Abstract
This paper gives an introduction and research results on the Nd-doped fiber amplifier. We have constructed calculation models and programs of the Gain and Noise Figure with changing pump power, signal power, number of doped ions per unit volume, and fiber length using MATLAB. When the pump power or ion concentration increases, or the signal power decreases, the Gain has an increasing trend as presented in the research results. The Gain reaches a maximum when the fiber length is 1.35m. The Noise Figure decreases with increasing signal power or decreasing ion concentration. It reaches a minimum with a high pump power and a fiber length of 1.4m.
The Theoretical Derivation and Exploration of Gravitational Wave
Authors: Wen Xiangyu 
Published: June 2022

Abstract
This paper mainly records the theoretical system of gravitational waves and the mathematical derivation process. At the same time, it also mentions the working principle of the laser interference gravitational wave observatory. It belongs to the learning of the gravitational wave entry-level, and it can also help you understand and learn gravity waves faster from a professional point of view. The end of the article contains some of my discussions on the future development prospects of gravitational waves.
Interference Coexistence Analysis Between IMT-2020 System and Radar in the Same Frequency Band
Authors: Yang Jian , Chang Zengtian , Yuan Chunxing , Sun Jiwei , Luo Siwei , Li Chenyong , Li Xiaoliang 
Published: June 2022

Abstract
Due to the interference coexistence between IMT-2020 system and radio locating radar system in the 3 400 ∼3 600 MHz frequency band, based on the coexistence scenario of this frequency band, this paper sorts out the typical frequency parameters of radar and the key parameters of base station, and establishes a propagation model. The interference between IMT-2020 system and radar system in the same frequency band is analyzed by means of system modeling and Monte Carlo simulation. According to the interference threshold of the system, the interval distance required for the coexistence of the two systems is obtained, and the interference avoidance measures are proposed to realize the coexistence of the two systems.
Research on Scenarios Construction for Automated Driving Functions Field Test
Authors: Xu Zhenhai , Bai Yun , Wang Guanjun , Gan Changhong , Sun Yuxiang 
Published: June 2022

Abstract
To promote the automated driving function field test for intelligent & connected vehicle in vehicle proving ground, a scenario construction method for automated driving functions field test is proposed in this paper. Firstly, through a systematic analysis of the 29 required scenarios and the actual roads situation in vehicle proving ground, 7 clusters of basic road characteristics of scenarios are summarized and taken as the basic items. Then, different special pavement marking, traffic light & sign and target are added in turn on the basic item of a selected scenario by a variable item with layered architecture to complete the scenario configuration flexibly. And the proposed method can clearly show construction difficulty of each scenario, and multiple scenarios can be constructed in the same site, which can realize a reuse of a single site in closed field to improve the test efficiency.
Flight Control System Simulation for Quadcopter Unmanned Aerial Vehicle (UAV) based on Matlab Simulink
Authors: Fan Yunxin 
Published: June 2022

Abstract
Unmanned aerial vehicle (UAV) are widely used in military and civilian applications due to its advantages of strong maneuverability. Flight control system simulation of a UAV is always a research focus. At present, there are three major algorithms for a UAV flight control: strapdown inertial navigation system, Kalman filter algorithm, flight control Proportional-Integral-Derivative (PID) algorithm. In this study, UAV flight control system and quadcopter drone flight control principle are discussed. In addition, this research developed a dynamic model based on a thorough examination of the quadcopter drone’s frame construction and features. This dynamic model describes the transformation matrix of UAV coordinate system to ground coordinate system. Matlab Simulink was used to simulate a flight control system. A quadcopter drone’s vertical movement, yaw motion, pitching motion, and roll motion, as well as its flight attitude, were simulated and described. Dynamic modeling is developed based on the drone’s flight principle and force relationship in different motion states, as well as the Newton-Eulerian model. Matlab Simulink was used to simulate the trajectory of a quadcopter drone. The red line denotes the trajectory, while the black x markings denote a change in trajectory or a specific position. Blue lines that reflect the waypoint’s heading accompany specific poses. The results of this study could provide a good reference for the simulation of a UAV flight control system.